File types which can be shared

Which file types can be shared? I can successfully share .mp3 and .sit files that are in one of my shared folders, but some other shared folders don't have anything in them when viewed through the library (which I assume means I can't share these files). Is there any way to change this? The files aren't compressed but aren't large either, and some people might like them

[Paradog]

To set up which file types you want LimeWire to share, go to the menu bar and click on:
- Tools
- Options

Then you click on "Sharing" and add the extension of the filetype you want to have shared.