Use WinRAR or 7-Zip to handle the .rar extension.
However, if you are looking to create a blog post to share or document this specific file, Technical Archive: CU0MfCkb1R4eVe3 (Part 01)
This post serves as a documentation point for the compressed archive labeled . This file is part of a multi-volume set required for complete data restoration. File Specifications Filename: CU0MfCkb1R4eVe3 Part01.rar Format: RAR Archive (Volume 1)
This is a split archive. To extract the contents successfully, you must have all subsequent parts (Part02, Part03, etc.) in the same directory. Extraction Instructions
Check the MD5 or SHA-256 checksum (if provided by your source) to ensure the file was not corrupted during transit.