c:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe /dde
Windows Object
VisualStudio.c.9.0
There are many ways to open file with specific file extension. There could be also multiple applications which you can use to open C file. Learn more how to open APK file. Also you can try using hex or text editors like HexView or Notepad++ to open C files.