Enterprise developers use IPAs for Over-The-Air (OTA) distribution, where a manifest file tells a device how to download the IPA directly from an internal company server. What About Jailbroken Devices?
Before renaming, you must ensure the folder structure is correct. An iOS device will not recognize the file if it is just a random collection of files. convert zip to ipa work
Are you trying to package the app for or automated testing ? convert zip to ipa work