Make a new NowPlaying measure having PlayerType=File and add to it something like:
or some other substitution to either leave only the file extension or extract it from the full file path. This is not tested, but if your AIMP is fully supported by NowPlaying, it should give you an idea of how to achieve what you want.
Reference:
https://docs.rainmeter.net/manual/measures/nowplaying/
Code:
RegExpSubstitute=1Substitute="^.*\.":""
Reference:
https://docs.rainmeter.net/manual/measures/nowplaying/
Statistics: Posted by Yincognito — Today, 9:34 am