For the Linux part, even grep on the command line doesn't find text in a Windows-1251 encoded text file on my system. And this is when I pass a plain ASCII search term to grep.
It seems grep treat these files as binary files and in Geany we explicitly ignore binary files (via command line parameter -I). If you add "-a" to the extra options field in the FiF dialog, grep will treat binary files as text files and the search seems to work, at least in my case.

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