If you’ve found an audio resource (be is sound effects or music) but want it in a format supported by Eclipse (which formats Eclipse supports I am not sure. I know for a fact it supports mp3, as that is what the default music is, and I would imagine sounds can be in wav as well, but I am not for sure) I found this website that could convert the files for you:\
Just upload the files (you can upload multiple at a time), choose the output format, select your desired audio quality, and press convert! Leave the tab open and it will automatically update and convert the sounds, allowing you to download them all in a zip file.
Hope this comes in handy for somebody.