Hi,
I want to patch an exe with olly, I open the exe, dbclick the line and enter the value I want, I right click and 'copy to exe' then on the new window rightclick and save but it pops save mscore.dll, try to save mscore but denies access, how can I patch the data and remain to exe and save the exe to disk?

Ty

Seems to me that the file you are trying to patch is a .NET executable (Right??)

A good deal of the true executable code of .NET is actually run by a System file called mscore.dll, which is a system library. If you did modify it (provaided you could) it would change the behavior and likely crash ALL .NET executables.

.NET apps patching is a different game, rather advanced by the way; thus Ollydbg tracing and patching is not the way to go.

thank you naides, you're right it is a .NET application, any good dissasembler debugger for Net? I heard of IL spy.

try Reflector+Reflexil Plugin.

I tend to run .NET assemblies through de4dot if they're obfuscated, which usually restores them to the point where the code at least compiles. Then I extract the source files with ILSpy (free alternative for reflector) and open them up in Visual Studio. There I can freely debug, analyze, edit or recompile the program.

x86 debuggers like OllyDbg are for x86 instructions, not MSIL.