They are in a file called ScreenshotCaptor.ini, which on versions of windows prior to Vista, will be in the C:\Program Files\Screenshot Captor directory itself along with the actual program, and on Vista and Windows 7 should be in your Documents\DonationCoder\ScreenshotCaptor directory.
Note that you can also tell the program to store this file wherever you want by editing the configdir.ini file inside its program directory.
