Chancing name .exe (after build)

[Oromis]

Hello,

I've this program, called "falling". When I build this project, it all runs fine. But when I chance the name from "falling.exe" to "falling1.exe", the program is crashing at a certain point. Why is this happening? And is there any way to work around this, other then chancing the name of the project before building it?

[edit]
The program is running fine with the name "falling1.exe", but not with the name "falline1.0.exe". I guess the '.' is the problem.