Resource Hacker problem

[professional DCer]

Whenever I change something in lf2.exe with Resource Hacker and then save it, there are two exe files made in lf2 directory, lf2.exe and lf2_original.exe. The first one (lf2.exe) doesn't work while the second one (lf2_original.exe) is the old one. Lf2.exe doesn't work. Whenever I open it, it crashes.

Please anyone help me if you know the solution to solve this problem.
Thanks in advanced!