Our apps, such as iCMTGIS PRO, provides the ability for users to open a job file received as an email attachment. Our apps use application:openurl:option to get the URL for the job file (*.pmp). We use [URL path] to convert it to NSString format. Then we use fopen to read the .pmp job file in "read only" mode.
On iPad Air (5th generation) running iOS Version 18.6.2, our apps are able to read the .pmp job file.
However, on iPhone 11 running iOS: 26.2, using fopen to read the .pmp file, we get a NULL value and are not able to correctly read the .pmp file.