Adobe should have built a brush manager into Photoshop decades ago, but never did. The OS cannot read .abr files. To say Photoshop's way of "browsing" the contents of .abr files (by individually loading each .abr file into Photoshop) is antiquated and clumsy is an understatement!
There is a large community of painters and compositing artists who would appreciate an elegant way to navigate, view and directly load and unload brushes. My own Brush folder is 17.48 GB, with dozens of folders and subfolders populated with many .abr files. Please Adobe, can you give some love to the most important tool in Photoshop, and at least give us a way to quickly view the brushes in an .abr file without loading it into Photoshop?