GCC object files and Microsoft linker

[Maurício]

   Hi,

   I don't know if this make sense, but I would be happy if so: I need 
to generate object files (from Fortran source) for a proprietary program 
that is going to link it against it's own object files. (The idea is 
that I can change some of the internal subroutines to fit my needs.) I 
was told I need to use Microsoft Visual Studio and Intel Fortran 
compiler (both proprietary tools) to do that.
   Do you think I could at least use gfortran to generate object files 
that are going to be linked with Microsoft linker? Or, better yet, use a 
gnu linker to link my object files against those compiled by Intel Fortran?

   Thanks for your help,
   Maurício