You will need file decompression software to access the contents.
Because I cannot see the contents of your file, here is a general write-up/description for this type of file based on common use cases: - Overview File Type: Compressed RAR Archive (.rar). SPECIAL1000_PACK1.rar
Always scan extracted files with anti-virus software to ensure security. You will need file decompression software to access
Usually contains a collection of documents, images, assets, or software files bundled together for easier downloading. or The Unarchiver (Mac).
If you can tell me or what type of items you were expecting inside, I can give you a much more specific description of what the pack likely contains.
Use software like WinRAR , 7-Zip , or The Unarchiver (Mac).