open up the command line change the command line's directory to where those files are at; like so cd C:\DirectoryOfFiles type enter now, type and enter the following copy /b XXX.wmv.001+XXX.wmv002+XXX.wmv.003 XXX.wmv.rar There; you didn't even have to download any special programs that'd make you pay $20. wait...this is about rar files, right?