Winrarx64521b2exe+better < TRUSTED >

The "winrarx64521b2.exe" file is a legacy 64-bit installer for WinRAR. According to official release notes from RARLAB, version 5.21 Beta 2 focused on:

Why WinRAR X64 5.21 B2 EXE is Better

• “Best” method, dictionary size 64 MB or larger, solid archive for many small files.

1. The Filename Breakdown