What is a .git.dmp file and how can I use it?
git
Solution
Check if it is possibly a git bundle. If that's the case, you can simply clone it to a new directory:
git clone whatever.git.dmp whatever
Problem
I just backed up my unfuddle account and it sent a zip file with my git repositories as a .git.dmp file. Do I just remove the .dmp ending and use it like a normal .git repository?