Since .rar is a proprietary compressed format, you will need specific software to extract its contents:
: If this was downloaded from a forum or shared via a link, check the original post or documentation for a description of its contents. 2. How to Open the File Abi_Exp.rar
Knowing where you found the file or what project it’s related to would help me give you a more specific breakdown of its purpose. verify where you got it.
Before opening any unknown compressed file, verify where you got it. Abi_Exp.rar