Could you tell me or what it's supposed to be (e.g., a game mod, a repair manual, or software)? Knowing the context will help me find the specific guide you need.

You will need a utility like WinRAR or 7-Zip to open the archive.

Specific hardware drivers from manufacturers' FTP sites sometimes use internal ID numbers.

Where did you download this file? Checking the original webpage or forum thread is the best way to find a guide or installation instructions.