

Do not use Windows' built-in zip extractor. It fails with complex passwords.
The GSMVNTOOL file password mechanism is a textbook example of “security by obscurity” — easily reversible via static XOR. While sufficient to prevent casual tampering in the early 2000s, it offers no real security against any user with basic hex editing or scripting knowledge. Modern forensic and reverse engineering toolkits can instantly recover these passwords. GSMVNTOOL File Password