Right-click the file and select "Extract Here" using a tool like 7-Zip or WinRAR.
High-level compression is "taxing" on hardware during runtime if not handled correctly. Tools like SNUG on Steam or the Windows "Compact" function can help manage this by transparently compressing files to save space without a massive performance hit.
"Them and Us" is a classic-inspired survival horror game that emphasizes atmosphere and puzzle-solving.