17-3-2x.rar

It could represent a version like v1.7.3 with a "2x" modifier (possibly referring to a 2x speed mod, 2x texture pack, or a secondary revision).

If you have encountered this file on a forum or file-sharing site: 17-3-2x.rar

While no "detailed post" exists in public records for this exact string, similar nomenclature typically refers to: It could represent a version like v1

In some technical contexts, these numbers represent build dates or specific hardware revisions (e.g., March 17th). 2x texture pack

RAR files from unknown sources can contain executable malware. Use a multi-engine scanner like VirusTotal before opening.

any reason to prefer WinRAR/WinZIP to 7-Zip? - Windows