WhoCalls can query a directory of files, find the binaries, and search for a user specified Win API import. It works with both 32-bit (PE) and 64-bit (PE32+) file formats (.exe, .dll, .sys) This is an improved version of my old C WhoCalls program. The old C version can be found here.
WhoCalls.exe [Path To Query] [API Name]
API Name: A valid Windows API function.
Path To Query: A valid path to a directory containg the executable(s).
E.g. whocalls C:\Windows\System32 ExitProcess