Starting Mnemosyne from a different directory

Mnemosyne can be started from any directory (folder on Windows) of your choosing (by default, it is .mnemosyne and stored in the user's home directory).

For Linux and Mac OS X, just use the -d option at the command line:
mnemsosyne -d /WhereIWantToGo/DirectoryOfMyChoice

For Windows, open a command prompt (Start-> All Programs-> Accessories-> System-> Command Prompt) and type:
C:\Program Files\Mnemosyne\Mnemosyne.exe" -d your_custom_data_dir