If you're using VBA you want the Shell command instead of RunApp.
You can open most programs with a specific file by just adding a space and the file path/name to the command line string, for example:
Shell "c:\program files\accessories\mspaint.exe c:\windows\1stboot.bmp", vbNormalFocus
Opens the Windows Paint App with a bitmap file called 1stboot in c:\windows\
Or if you want to open a file where the path and name are stored in a variable (called strYour...etc):
Shell "c:\program files\accessories\mspaint.exe " & strYourFileNameAndPath, vbNormalFocus
HTH
Mike