If you’ve installed Felix version 1.4 or later, you might notice that “.fhist” files are created next to your MS Word or Excel files when you translate them. This is due to a new feature of Felix called translation history. Translation history makes it easier to revise your translations, and reflect your edits in your translation memory. For details about translation history, see here for Word and here for Excel.
If you don’t need this feature or don’t want these files to be created, then you can disable translation history in the preferences.
In Word, from the Felix menu select Felix Preferences, then go to the “Translation History” tab and clear the checkbox.
In Excel, go to Felix >> User Preferences, and do the same.