Are you trying to these files into a specific program, or just looking to extract them?

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. How To Install 7Z / Zip Files

If you are looking for a specific file named exactly santa_extra.7z , it is likely a custom mod or asset pack for a game or software. You should treat it as a standard archive and extract it to view the specific contents.

(often similar to "santa_extra") is typically a supplemental package for the 7-Zip archiver that contains advanced command-line tools and libraries. What is usually inside

: Use the official 7-Zip program or WinRAR by right-clicking the file and selecting "Extract Here" .

: A module used for creating self-extracting installers. How to open it

When you open a "7z Extra" archive, you will generally find the following components: