Origin in
http://www.plcsimulator.org/

project folders:
src/mod_rssim  - application
src/mylib      - required library
src/testserver - test application (optional)

The test application is not required for building.
Open the mod_rssim project in VC6 or VC9

The test application is internal use only - requires a few things to set up, and is onlyusefull to internally test the program.