You're looking for information on IPA files for iOS 7.1.2. Here are some useful points:
If you don’t have an active Apple ID or prefer not to connect your vintage device to the internet, IPAs allow full offline installation. ipa files for ios 7.1.2
IMG4 signing (not relevant for IPAs but for firmware).files—the application package format for iOS—you typically need to use third-party archives and specific sideloading tools. Back Market Customer Care Where to Find iOS 7.1.2 IPA Files You're looking for information on IPA files for iOS 7
Info.plist: Contains app metadata like the Bundle Identifier, MinimumOSVersion (which must be 7.1.2 or lower for this firmware), and CFBundleExecutable. unzip AppName
Security Risks – iOS 7.1.2 is outdated (released in 2014) and contains known unpatched vulnerabilities. Discussing methods to install arbitrary IPA files on this version could expose users to malware, data theft, or device compromise.