hopefully that should be it. In that directory, there should be no subdirectories. That is, this file should exist:
C:\Users\REPO\AppData\Roaming\Sublime Text 2\Packages\spadgos-sublime-DefaultFileType-9c82596/default_file_type.py
If that's the case, then sublime should automatically pick it up. To see if it's working or not, inside sublime open the python console by pressing Ctrl + ~ (tilde, the key next to the 1 on a US keyboard), and then type "sublime.log_commands(1)". This will cause all the commands which are being executed to be logged to the console. After that, press Ctrl+N, and hopefully you should see "command: default_file_type". If it says "new_file" then the command isn't being run.
Afterwards, don't forget to turn off logging with "sublime.log_commands(0)"