Chew-WGA (Windows Genuine Advantage) is an "activator" or "patcher" designed to suppress activation prompts and allow unlicensed copies of Windows 7 to appear as "genuine". Unlike some loaders that modify the BIOS/SLIC table, Chew-WGA typically functions as a software-level patch that disables or removes WGA-related system files .

: Because it modifies core operating system files, it can cause unpredictable software behaviour or system crashes.