"The file does not represent an Application or is corrupted."
Can you advise on the proper method for migrating applications/jobs from version 12.0 to 12.2?
Component : CA WORKLOAD AUTOMATION DE (DSERIES)
The proper method for migrating applications/jobs from DE version 12.0 to 12.2 is using the migration utility that is shipped with the DE Server 12.2. You can only use the imexutil export/import utility to move application artifacts of the same DE version. See the docops for more information;
"We recommend that you use the import/export utility only between the servers of the same release. For example, you can import Applications from one 12.0 server to another 12.0 server but not between a 12.0 server and a 12.0.01 server. To migrate artifacts between the servers of different releases, use the migration method."