1. First search for sapcar.exe. Its usually located at \usr\sap\sid\dvebmgs00\exe
  2. Copy the sapcar.exe to the folder where you saved all the *.sar files.
  3. Start > Run > cmd > browser to the folder with *.sar files
  4. Execute SAPPCAR -xvf  ".sar"
Without " " it will not work.