I hope you keep backups on other media.
Close Money.
Note that you don't want to put your *.mny file within \Program Files or \Windows. Your Documents folder is a good place.
Search your hard drive for *.mny files. If it is in a place that you don't want it to be, copy it to your Documents folder. In Windows explorer, right-click on the file you want to open, and choose Open.
If you don't like the file search function that you have, I like Agent Ransack.