Curious error this. Am trying out Pro 7.00.4; never noticed this with previous bought versions but I don’t know the exact version when the behaviour might have been introduced.
When doing a Find-in-files – with or without escape sequences, but no regexps – EmEditor finds many spurious matches of the search string (regardless of what it is) at random points in binary files such as images. Regexp search, on the other hand, is fine.
I don’t know what the problem is, but you might want to check the opening Encoding. If you believe this is a bug of EmEditor, please send me the sample file (after zipped) I can reproduce this issue with the detail procedure at firstname.lastname@example.org . Thanks!