Afternoon folks!

Simple one (Me hopes)!

I have a program that manipulates a text file, which another program will in turn use, but I want my program to check for the presence of the other program on the users hard drive. The program I want to check for is installed properly using an installer.

I think it can be done by checking certain registry keys, but I don't know any more than that, aside from the name of the .exe, the program knows nothing else about the program. Any pointers?