To start, unzip the file. You will find:

app/sfe1    # containing the simple (silly) FORTRAN example sfi1
       # cboincfinish.cpp, cboincinit.cpp and
       # cboincresolvefilename.cpp are the wrappers
       # sfe1.f90 and strlng.f90 are part of the example code. sfe1 call the
       # wrappers listed above
include       # containing *.h and the new file C_boinc.h
lib           # containing the final BOINC libraries CBOINC.lib and
              # CBOINC_D.lib (debug version)
src           # containing the original BOINC source needed and C_boinc.cpp
              # (my C API)
win_BOINC/CBOINC/CBOINC.dsw   # project workspace with library source
                              # and example source (START FROM HERE!!!)
testSFE1      # test directory for testing the example (nothing important!)

To compile, I used VS 6 and Intel Visual Fortran 7.1.