"PACK N 73.rar" is not a widely recognized official software or game package. It follows the naming convention of a , a proprietary compressed file format used to bundle multiple files or folders together to save space.
: In some cases, files ending in numbers like .R73 are parts of a larger split archive (e.g., Part 75 of a massive multi-part file). How to Open It Safely
To access the contents, you must use decompression software. is a proprietary format, so while it is free to extract, you need specific tools: How to open R73 file (and what it is)