Question

which is best for compressing 65+ gb game in kb?

Answer 1

I would say based on that hilighted line someone either doesn't know what they're writing about or it's a fake (possibly malicious) file by someone who doesn't understand compression or English.

File Size: 5MB   - ok, compressed file is 5 megabytes
Compressed is KB - Kilobytes? They just said it was in megabytes.

Plus it's an RAR file, so there's nothing special about the compression used.  Going from 20GB to 5MB isn't anything special if there's a lot of entropy in the source files.  It would be trivial to construct a 20GB file that compresses down to 5MB.  If there's an executable in that RAR it's probably malware or a download installer.

Answer 2

Kgb Archiever

Hope it will help