.exe.dll File Editor?

How do people make these hack files? is there some kind of special program? whats it called?

Uhh its called renaming it.
eg:
.dll
.exe
.bat

'

stfu choob

its called a decompiler, google c++ decompiler and u should find some

Yes, decompiler is right.
But when you open it up, reading what they doing inside is another level.
You dont have a clue, what these languages coding all about, execpt to be a programmer