@pallieguy said in Notepad++ 8.4.2 not recognizing file extension to define language:
I wonder when I did that?
Probably at one of the updates: there was a while when the installer would not notice an old installation if it wasn’t in c:\program files\notepad++, so even if you had installed to D:\notepad++\, the updater/installer would put the newer copy in c:\program files\notepad++ instead. IIRC, that has been fixed (I spent a couple minutes searching through the issues list, but wasn’t using a narrow enough set of search terms, so couldn’t find it buried in all the other results), so the next time you run the installer/updater for whatever version you end up keeping, it should hopefully default to the existing location.