In PE Explorer there is a Dependency scanner for EXE and DLL files. PE Explorer Dependency Scanner Viewer: look inside dll with this dll analyzer tool find dll dependency
You can check out, which DLL's program depends on.
You sould see something like
Msvcr90.dll for Microsoft Visual C++ 2008
Msvcr80.dll for Microsoft Visual C++ 2005
mscoree.dll for Microsoft .NET
But sometimes there are a lot of dlls, and only some of them are the ones you need.