You cannot use a .rar file directly in 3D software; it must be "unpacked" first. Use WinRAR , 7-Zip , or the The Unarchiver (Mac).
What kind of content are you trying to build (e.g., a , a 3D print , or a social media animation )? Convert RAR to FBX for free - ImageToStl - Image to STL 3d.rar
Use online tools to batch-convert .rar models to other formats. You cannot use a