The extension .abr is the native format for Photoshop brush presets.
Custom textures, skin overlays, or track/car physics data. abr_6-9.rar
It is a compressed RAR archive, meaning you need software like or 7-Zip to open it. 🛠️ How to handle this file The extension
Look at the website where you found the link. If it was a digital art site (like DeviantArt), it is almost certainly a brush set. Open with Caution: Right-click the file and select "Extract here." abr_6-9.rar