Simple .csv file splitter .exe

We are in need of a very simple .exe file splitter for .csv files that can be called from the command line like this [login to view URL] logfile inputfile splitnum [login to view URL] then begins to split inputfile into 'splitnum' parts. So if inputfile was [login to view URL] and splitnum was 5 the program would create [login to view URL], [login to view URL] [login to view URL] [login to view URL] and [login to view URL] in the same folder as the program. IMPORTANT: the header line from the original inputfile must also be inserted into the final files [login to view URL] also needs to create logfile (if it doesn't exist) and write 'working' to the 1st line of it at least once per minute to tell our outside script that your .exe is alive. Once [login to view URL] finishes it should write 'success' or 'failure' to logfile to tell our script it's finished and what the result was. We would like to be able to process 100,000 record csv files with 20 fields (under 50 characters each) in under 1 minute if possible...we have other manual scripts that perform along those line. We also have a lot of script installations to be done on an ongoing basis so if you also do script installs there could be a substantial amount of regular additional work available for you.