Hi,
these are the icons I use for .ogg files.
You might want to use them in xfe.
I think that they are kind of retro, and imply that the file is of compressed audio form.
Of course they can be used for other compressed audio file types, as well.
There are two different versions, one for 16x16 and one for 32x32 size.
The original source .svg file was found here:
https://openclipart.org/detail/99721/cassette-stylised
I have uploaded my .svg files versions here:
https://openclipart.org/detail/292173/ogg-16x16-icon
https://openclipart.org/detail/292174/ogg-32x32-icon
I will attach the .png icon files, for xfe, and a couple of screenshots, on how they look on my computer.
"Real world" view.