amule is not installaed in one folder. Linux is not windows, ehre you install all the application in its own folder and put it in program files. Here, all the binaries go to one folder, the docs, go to another, the pixmaps, go to anoter, etc. The common root of aal these is probably /usr or /usr/local. Do what thedude0001 said, to be sure.
Regards.