.Soulseek.nnnnnnnnn files

I have a bunch of .Soulseek.nnnnnnnnn files in my home directory (eg. .Soulseek.1361654771973, .Soulseek.1361663549576). Are these safe to delete? If they are temp files, shouldn't they be created in /tmp ?

I'm using SoulseekQT build 2013.2.26 on OS X.

Regards,
Daniel Serodio