I see; then using the flag eeFindReplaceOpenDoc for document.selection.Find() to search all open documents is the method to use, as you used, or in Uni_CJK_2.jsee. EmEditor does freeze when processing large documents, but it is working. If you have enough memory available in your system, turning off “Use Temporary File to Reduce Memory Usage” in Tools > Customize… > Advanced will decrease search time. When you start the script I recommend waiting for a couple hours, then come back to see if it finished.