On 27 August 2012 19:38, Jason Clark wrote: > Jonathan, > > As you suggested I tried typing in the following: > > gfortran -I c:/programfiles/aspentech/aspenplus2006.5/engine/commons > -xf77-cpp-input usrkpg2.f > > And got the same error abour the missing file back. I also noticed > that if I subsitute in: > > "z:/" instead of the "c:/..." when no z drive exists does not come > back with any error. I am wondering if the preprocessor is not getting > to the correct folder. When I try typing in the location using > "Program Files" instead of "programfiles" it gives me an error about > not finding the directory seemingly due to the space. You'd need to surround a pathname in quotes if it has spaces, I believe that's true on Windows as well as unix-like environments. And if you're using the Windows command line you need to use backslashes not forward slashes (if you're using Cygwin that might not apply.)