• Fixed an issue with the Open command when document tabs are disabled.
• Fixed an issue where automatic updates for the Microsoft Store and MSIX versions did not work while the tray icon was running.
• Fixed a potential crash after changing options on the History page of the Customize dialog box.
• Fixed some UI elements related to Dark Mode.

If you use the legacy MSI installer, select Help > Check for Updates to update EmEditor. If the update does not complete successfully, please download the latest version and run the installer manually.

The Microsoft Store version is expected to be available within the next few days. If you download the MSI installer directly, please verify that its digital signature is issued by Emurasoft, Inc.

We recommend using the Microsoft Store version or the new MSIX installer. Updates for the legacy MSI installer are currently scheduled to end in March 2027. For more information, see FAQ: Store Version and New Installer (MSIX).

• Fixed a potential crash when opening multiple files simultaneously.
• Fixed an issue introduced in v26.2.1 where it might not be possible to send an entire very large document to an external tool’s standard input.
• To reduce download and installation failures, the Store and MSIX editions no longer include local Help in the package, consistent with other editions. If you need local Help, please download and install the separate Local Help installer.
• Fixed the icon background color for the Store and MSIX editions.
• Fixed some UI issues related to Dark Mode.

If you use the legacy MSI installer, select Help > Check for Updates to update EmEditor. If the update does not complete successfully, please download the latest version and run the installer manually.

The Microsoft Store version is expected to be available within the next few days. If you download the MSI installer directly, please verify that its digital signature is issued by Emurasoft, Inc.

We recommend using the Microsoft Store version or the new MSIX installer. Updates for the legacy MSI installer are currently scheduled to end in March 2027. For more information, see FAQ: Store Version and New Installer (MSIX).

• Fixed an issue that could cause the wrap mode to change to No Wrap after opening a file.
• Fixed a potential crash when starting EmEditor while checking for conflicts with other versions.
• Fixed an issue with Markdown/HTML style updates.

If you use the legacy MSI installer, select Help > Check for Updates to update EmEditor. If the update does not complete successfully, please download the latest version and run the installer manually.

The Microsoft Store version is expected to be available within the next few days. If you download the MSI installer directly, please verify that its digital signature is issued by Emurasoft, Inc.

We recommend using the Microsoft Store version or the new MSIX installer. Updates for the legacy MSI installer are currently scheduled to end in March 2027. For more information, see FAQ: Store Version and New Installer (MSIX).

• Fixed a possible crash immediately after opening a file.
• Fixed the opening dialog in Store and MSIX versions.

If you use the Desktop Installer edition, select Help > Check for Updates to update EmEditor. If the update does not work, please download the latest version and run the installer manually.

The Microsoft Store version is expected to become available within the next few days. If you download the MSI file directly, please verify that its digital signature is signed by Emurasoft, Inc.

• MSIX versions are now available through both direct download and the Microsoft Store.
• Fixed an issue where search highlighting did not work after reloading a file.
• Fixed a potential crash that could occur when opening more than 2,000 files with line wrapping enabled.
• Improved performance when opening many files from the command line.
• The new versions skip the InstallTypeLibrary call during MSI installation.
• Fixed an issue that prevented Properties for All Configurations from being selected after using Reset All Settings.
• Fixed a phantom taskbar icon that appeared when selecting Edit with EmEditor from the Windows 11 context menu.
• Fixed a printing color issue when Windows dark mode is enabled.
• Reduced errors that could occur while verifying digital signatures when loading files.
• EmEditor will no longer load itself or DLL files unless they are digitally signed by Emurasoft, Inc.
• Fixed a potential out-of-memory crash when using Select All.
• Fixed an issue on the Toolbar Buttons page of the Customize dialog box.
• Disabled double-clicking on the AutoRepeat handle.

If you use the Desktop Installer edition, select Help > Check for Updates to update EmEditor. If the update does not work, please download the latest version and run the installer manually.

The Microsoft Store version is expected to become available within the next few days. If you download the MSI file directly, please verify that its digital signature is signed by Emurasoft, Inc.

EmEditor v26.2 has been released, enabling AI-powered writing assistance features to be used with local AI and more
https://forest.watch.impress.co.jp/docs/news/2120925.html

If you can use AI as much as you want, there’s no need to hold back! Using local AI with EmEditor offers many benefits
https://forest.watch.impress.co.jp/docs/topic/special/2119037.html

1. Enhanced AI Features

In this version, we enhanced the highly requested AI-related features. As in previous versions, the AI-related features fall into two main categories.

1-1. AI Writing Assistance

AI Writing Assistance, first introduced in v24.1, has been further enhanced with the following additional options.

• Customize dialog > AI Options
  • AI Provider and Model: Previously, AI-assisted writing could use only OpenAI, but starting with this version, you can also select Anthropic, DeepSeek, Google, and LM Studio/OpenAI-compatible providers. For example, by using a local LLM through LM Studio, you can enjoy the benefits of AI-assisted writing without worrying about AI usage costs. When using a paid AI provider that requires an API key, you must specify the API key in advance under Settings in Chat with AI.
  • Show additional information on status bar: When this option is turned on, information is shown on the status bar whenever a prompt is sent to the AI or a response is received.
• Configuration Properties > AI Assist
  • Show suggestions only when confident: If you do not want to receive AI suggestions too frequently, you can check this option to show suggestions only when the AI is confident. When this is checked, you can use the Confidence level slider below it to set the minimum confidence level required to display a suggestion. Because judging confidence is difficult for AI, and some AI models may not interpret it correctly, we recommend turning this off if you do not need it.
  • Set the temperature: In AI, temperature is a parameter that controls the “randomness (creativity)” used when the LLM chooses the next word while generating text. The lower the temperature, the lower the randomness, and the more deterministic the suggestions you receive. The higher the temperature, the higher the randomness, and the more creative the suggestions you receive. When the Set the temperature option is off, the model’s default temperature is always used. When it is on, a temperature of 0.0 is used initially so that you receive deterministic suggestions; however, when you press Ctrl + Space to request a different suggestion, the temperature is raised to produce more creative suggestions. Many recent reasoning models do not accept a temperature parameter, in which case this option is ignored. If an error appears on the status bar because the temperature cannot be set for a particular model, please turn this option off. For AI-assisted writing, we recommend specifying a lightweight model that returns responses quickly, rather than a reasoning model.
  • Don’t show suggestions after any of the following: If you check this and enter characters that indicate the end of a sentence in the field below—for example, “.。”—suggestions will no longer appear after symbols such as “.” or “。”. This lets you tailor the feature for easy use according to the type of text you are editing.
  • Delay Time: AI suggestions appear automatically after the specified amount of time has elapsed once typing stops and the editor becomes idle. You can adjust this delay time in milliseconds using the slider.
  • Additional instructions: Here, you can add instructions such as what kind of suggestions you want to receive, which language to use, and the desired tone. For example, when writing code in JavaScript, you can specify “Use JavaScript,” and if you want to use polite language, you can specify “Write in a polite style.” However, depending on the AI model, these additional instructions may not always be fully understood or produce an appropriate response, and entering too many instructions may slow down the response. Even so, now that more customization is possible, we believe you will be able to fine-tune the behavior to your liking through trial and error.

1-2. AI Prompts

This version enhances the AI Prompts feature, which was first introduced in v24.3. With AI Prompts, you can write a question to the AI in the editor and then easily send it to the AI. However, AI can make mistakes, and by comparing the answers from two AIs, you can obtain a more reliable answer. In this version, you can now specify two or more AI providers/models for each AI Prompt when needed. For example, you can send the same prompt to both OpenAI and Anthropic and compare their responses side by side in a split view. If the responses from two or more AI models differ significantly, you can suspect that one of them may contain an error. When using AI Prompts with program code, verifying with multiple models can help reduce bugs introduced by the AI. Note that when specifying two local AI models, make sure both models are loaded in LM Studio in advance. Otherwise, you may encounter an error indicating that one of the models could not be loaded.

1-3. The ChatAI Plug-in Is Required

Please note that to use the AI features, you need to install the ChatAI plug-in separately, in addition to EmEditor. However, as described below, the Store version of EmEditor will include the ChatAI plug-in, so there is no need to install it separately.

2. Introduction of MSIX Technology (coming soon)

MSIX is the latest Windows app package format provided by Microsoft. The existing Store version of EmEditor is soon going to be changed to a package based on this MSIX technology, and many features that were not available in the previous Store version are going to be available in it as well. As a result, the difference in features between the Store version (MSIX) and the Installer version (MSI) will be almost completely eliminated. The features that were not available in the previous Store version but will be available in this version include the following.

• Explorer Context Menu: The Windows 11 context menu in Explorer, a feature introduced in v24.1, will be available in the MSIX version.
• Jump List: The Jump List, which lets you run commands such as opening recently used files and Find in Files from the menu that appears when you right-click the EmEditor icon on the taskbar, will be available in the MSIX version.
• Command Prompt/PowerShell commands: Commands such as Command Prompt and PowerShell, which can be run from menus such as the one displayed when you right-click a document tab, will be available.
• Plug-ins that are not bundled: In the previous Store version, plug-ins that were not bundled could not be used. In the MSIX version, you will be able to download and use your own custom plug-ins as well as plug-ins published in the library.
• Export to the Registry and Import from the Registry: Using the Import and Export commands, you will be able to export EmEditor settings as a registry file or import them from a registry file.
• Saving files in protected folders with elevated privileges: In the previous Store version, files could not be saved to OS-protected folders such as C:\Program Files or C:\Windows. In the MSIX version, just like the other versions, you will be able to save files after responding to the privilege elevation confirmation prompt.

The MSIX package will soon be available not only as the Store version (MSIX) but also as a direct download. Corporate customers who cannot use the Microsoft Store will be able to use this Installer version (MSIX, direct download).

For a detailed comparison, please see Comparison of Installer, Portable, and Store Versions.

The MSIX version (both the Store version and the direct download) will be usable more safely than the Installer version (MSI) for the following reasons.

• The package installs and uninstalls cleanly, and settings are stored in a location dedicated to the app, so it makes no changes that affect the entire system.
• The Installer version (MSIX, direct download) will be signed with Emurasoft’s certificate. Because the package is designed so that it cannot be installed unless the signature of each file inside the package and the signature of the entire package match completely, it protects against tampering by hackers.
• With the MSI installer, arbitrary scripts could be executed through custom actions, but the MSIX package has no equivalent feature, so it protects against tampering by hackers who would exploit such scripts.
• The Store version (MSIX) is equally secure in terms of the tamper protection described above, but because it is additionally verified and signed by the Microsoft Store, it can be considered the most secure version.

Therefore, the MSIX version—whether distributed through the Store or as a direct download—is the latest Windows app package format recommended by Microsoft and is the most secure. If you are installing EmEditor for the first time, we recommend the MSIX version. If you are already using the Installer (MSI), you can continue to use it without any problem by updating with the update checker as before.

Individual customers who can access the Store are encouraged to use the Store version. Customers—mainly corporate customers—who cannot access the Store or are prohibited from using AI can continue to use the Installer version (MSI) as before.

For corporate customers or anyone who wants to completely disable AI features, please see “Disabling AI Features” in the FAQ “Are AI features enabled in EmEditor?”.

You can disable all AI features by using an IT management tool, such as Microsoft Intune, to create a REG_DWORD value named DisableAIAdmin in one of the following Registry locations:

• HKLM\Software\EmSoft\EmEditor v3\Common
• HKLM\Software\Policies\Emurasoft\EmEditor (v26.2 or later)

Set the value of DisableAIAdmin to 1.

3. Performance Improvements

In this version, we further accelerated the performance when opening huge files with very long lines, which was already improved in v26.1. According to our tests, horizontal scrolling of huge files without line breaks is about 14 times faster than in v26.0.

We also fixed bugs found during the development of the preview version.

We hope you will be satisfied with both the Pro and Free versions. If you have any questions, feature requests, or ideas, please contact us.

Thank you for your continued support of EmEditor.
— Yutaka Emura

For more details, including the main changes and screenshots, please see “New in Version 26.2”.

If you are using the Installer version (MSI), you can update from Check for Updates in the Help menu. If that does not work, please download the latest version and run the installer. Publication on the Microsoft Store is scheduled in a few days. When downloading the MSI directly, please confirm that the digital signature is signed by Emurasoft, Inc.

To update

If you use the installer version, please select Customize Update Checker on the Help menu, and set the Include preview versions in order to update automatically to future preview versions. Preview versions are also available from the links below or on the Previous Versions page.

Direct Downloads

• EmEditor installer (MSI)
• ChatAI plugin installer (MSI)

Note: After downloading, please verify that the digital signature is signed by “Emurasoft, Inc.”

Notes: The preview version supports only Japanese and English (United States). In other languages, new features may not be available.

Please contact us for any questions or comments. Thank you for trying EmEditor preview!

preview 1 (26.1.901) – June 3, 2026

General New Features

• The AI-Assisted Writing feature now supports additional AI providers, including Anthropic, DeepSeek, Google, and LM Studio/OpenAI-compatible providers, in addition to the existing OpenAI support. This feature requires the Chat with AI plug-in. [P]
• AI Prompts now allow you to select a second provider/model, so you can send the same prompt to two AIs at the same time. You can also compare the responses from the two AIs side by side in a split view. This feature requires the Chat with AI plug-in. [P]

New Options

• Added a Provider drop-down list box to the AI Options page of the Customize dialog box. [P]
• Added the Set Second Provider/Model checkbox, the Provider 2 checkbox and drop-down list box, and the Model 2 checkbox and drop-down list box to the AI Prompts page of the Customize dialog box. [P]

New Macro Features [P]

• The Run macros asynchronously by default option on the Options page of the Customize Macros dialog box is now turned off by default.
• The syntax checker is now disabled while a macro is running.

Bug Fixes

• Fixed an issue where certain regular expressions containing backslashes might not work correctly in case-insensitive searches.
• Fixed an issue where the Extract command in the Find dialog box could output text always in lowercase under certain conditions.

preview 2 (26.1.902) – June 9, 2026

• Added the AI-Assisted Writing command. Added the AI-Assisted Writing command button to the AI toolbar to enable or disable the AI-assisted writing. [P]
• Removed the HD and Vivid checkboxes from the AI Prompts page of the Customize dialog box. [P]
• Added the Show suggestions only with Ctrl+Space, Show suggestions only when confident, and Set the temperature checkboxes, Don’t show suggestions after any of the following checkbox and text box, the Delay time slider, and Additional instructions text box to the AI Assist page of configuration properties. [P]

preview 3 (26.1.903) – June 11, 2026

• Fixed a crash that could occur in Dark Mode in Preview 2. [P]

preview 4 (26.1.904) – June 18, 2026

• Added Language/Icon options to the Start dialog. [PF]
• Added a Show language/icon options check box to the Customize Start Window dialog box. [PF]
• Changed the default File Access Timeout value to 5 seconds. [P]
• EmEditor now displays a notification message at startup if it detects a different version of EmEditor. [PF]
• Fixed a Preview 3 issue related to AI prompts. [P]

preview 5 (26.1.905) – June 22, 2026

• The new version prints documents in light color even when Dark Mode is turned on. [PF]
• Fixed a regular expression search issue involving a backslash under certain conditions. [PF]
• Fixed issues with AI-assisted writing for specific AI models. [P]

preview 6 (26.1.906) – June 25, 2026

• Disabled AI model reasoning for AI-assisted writing. [P]
• Added the Show additional information on status bar check box to the AI Options page of the Customize dialog box. [P]

Notes

• [P] EmEditor Professional only
• [PF] EmEditor Professional and EmEditor Free

• Fixed an issue in v26.1.0 where the scroll position might not be restored when restoring a workspace.
• Improved the behavior when toggling word wrap.
• Improved comparison behavior while editing.
• Fixed an issue where EmEditor could crash when loading corrupted settings.
• Enabled the Move Line Up and Move Line Down commands in Markdown Design View.
• Updated the dialog box UI.
• Fixed the Find toolbar UI in dark mode.
• Improved the behavior when using LM Studio/OpenAI compatible with the Chat with AI plugin.
• Chat with AI now uses the proxy settings from Customize Proxy to download the app. AI requests also use the proxy settings.

If you use the Desktop Installer edition, you can update EmEditor by selecting Help > Check for Updates. If the update does not work, please download the latest version and run the installer. The Microsoft Store version is expected to be available in the next few days. If you download the MSI file directly, please confirm that the digital signature is signed by Emurasoft, Inc.

This year, five selection committee members, all active experts in Japan’s security industry, reviewed numerous security incidents that occurred between January and December 2025. Among them, 25 cases were nominated for their outstanding incident response efforts, and organizations that demonstrated particularly effective responses were recognized.

• Cyber Threats Have Become Incomparably More Sophisticated Over the Past 10 Years — EmEditor Developer Discusses the Reality of Supply Chain Attacks After Receiving the Award for the Second Time (Japanese)
• 11th Information Security Incident Response Awards Recognize Outstanding Incident Responses (Japanese)

We would like to once again express our sincere apologies for the inconvenience caused by this incident. We are deeply grateful for your prompt response, understanding, and cooperation throughout this matter.

We remain committed to further strengthening our security measures and continuing to provide reliable software and services to our customers.

Thank you for your continued support of EmEditor.

References:

Emurasoft Receives Excellence Award at the 1st Security Incident Response Awards (Japanese)

[Important] Security Incident Regarding the Download Path for the EmEditor Installer — Additional Information and Summary