: This usually signifies compatibility starting from iOS 11.0 .

The string you provided appears to be a specific for an IPA file , which is the format used for iOS applications. Based on the naming convention, this version of GoodReader —a popular PDF reader and file manager—is likely a "cracked" or modified version intended for side-loading onto iPhones or iPads outside of the official App Store. 🔍 Breaking Down the Filename

: If you are a developer or power user testing your own builds, tools like AltStore or Sideloadly are the standard methods for installing IPA files safely using your own Apple ID.