Depending on how you created your project, deftofd should be called automatically. If not, you need to add a build action as described in the documentation.

1. When you save your resource file for the first time, the resource editor also creates a Resource.h file. This file is included by the .RC file. To create the Fortran equivalent of this file (resource.fd), do the following:
   1. Add Resource.h to your project using File>Add Existing Item....
   2. Select the Resource.h file in the Solution View and the select View>Property Pages from the main menu bar.
   3. Set the Command Line option to use the deftofd tool by entering:
      deftofd resource.h resource.fd
      (For more information on the deftofd tool, see The Include (.FD and .H) Files.)
   4. Set the Description option to Generating Fortran include file...
   5. Set the Outputs option to resource.fd.
   6. Click OK.