Place all related .rar parts into the on your computer. 3. Extract the First Part
Verify you have the complete set of files. For a typical two-part file, you need: 1205_4_RP.part1.rar 1205_4_RP.part2.rar
Do try to open "part2" first. Most extraction tools are designed to start with the first volume and automatically pull data from the subsequent parts.