CASXB0043S The input file is not a valid MF Screens .srn file

The input file has an .srn (upper or lowercase) extension, but is not a valid Micro Focus Screens file. Some compatibility exists for migrating Micro Focus Screens files into this screen painter's native format, though some incompatibility does exist.
System Action:
Loading of the input file is terminated.
Resolution:
If the file was created by a version of Micro Focus Screens, contact product support with the input file being used. Otherwise, rename the input file using an extension other than ".srn".
Module:
scrload
Destination:
stdout