Linux 32-bit: SoulseekQt-2015-6-25-32bit
Linux 64-bit: SoulseekQt-2015-6-25-64bit
See the Changelog for list of features and fixes.
SoulseekQt uses your configured operating system associations for the file type you're trying to open. As Soulseek can handle files of all types I'm not sure how much sense it would make the have it explicitly handle particular file types.