Question on hex editing, and yes the thing I am editing is free for editing.

[Apokalipse]

Yeah, I really don't know what programming language it's in..... Didn't specify..... If I email maybe he'll give me source? Oh well, worth a try.

if you email him/her, you'll probably have a good chance. It kinda sends a message that you like their program.

 

[hillbillybob]

As for decompiling....I havent ever had any luck with it. I know decomp. a .net app can be a pain. Because everything goes to MSIL and then the CLR.

One route, see if you cant intercept the CPU commands. (assembly) Stop it there.

 

[void]

I know decomp. a .net app can be a pain.

.NET can be decompile because code is compiled into MSIL, then JIT compiled into native code. Because of this you should obfuscate your code, if you want security. A quick google search shows quiet a few programs to do decompile .NET code.

Programs written in C/C++ are harder as you will decompile to assembler.

Sounds like you want a debugger to add breakpoints to pause the execution of code. Something like GDB (GNU Debugger) but under windows and with a GUI.