calc.exe is copied from Windows XP SP2. TestCalc\calc.dll is converted from calc.exe by our EXE To DLL Service. TestCalc\calc.dll can be decompiled by DLL to C. This means we have a simple equation: EXE = DLL = C/C++.

You can get our EXE To DLL Service from:
https://www.dll-decompiler.com/exe-to-dll-service.html

If you want to decompile an EXE or load an EXE from memory, then just contact support@dll-decompiler.com.