To open RAR files, you can use WinRAR, which is the software made by the company that invented RAR technology. To open .001 files, you need another program, such as HJSplit, 7-Zip or File Joiner.

How to Extract a Single File From a Multipart RAR. WinRAR, a prominent data archiving utility, enables you to store files into data containers known as RAR files.