: Once installed, locate your MU_28-Luk_600-sm-cs.rar file.

: This is the native software for RAR files. While it is technically "paid" software, its free trial essentially lasts forever with occasional pop-up reminders.

Ensure you trust the source where you downloaded this specific RAR file, as compressed archives are often used to bundle software or mods which should be scanned with antivirus before opening.

: Right-click the file and select "Extract Here" or "Extract to [Folder Name]" from the context menu.