I was backing up my home dir when I found many ".jpg.pnj" and ".zip.id3" files. The ".pnj" files seem to be thunbnails for the ".jpg" files I have. On the other hand, no clue about the ".id3" files, since the program file tells me they are audio files.

I couldn't find any of these files not associated to a ".jpg" or a ".zip" which already existed.

I tried googling, but all I've got was how to tag MP3 files or convert image formats.

Can anyone tell me which program creates them? Is there a way to avoid such creation.

Thanks a lot for any hint.