What program are you using to extract, dinag? There have been similar issues, let me copy what our programmer replied with last time this happened.
To open the .rar file you need a program such as Winrar or 7Zip. If you're still unable to open the game, try downloading a NEWER version of the aforementioned unzipping program.
If none of those solutions work, join our discord server and you can add the game straight to your library.
Let me know if any of these potential solutions worked.
