How to discover if the Variable Length files are still available when selecting to product a Fixed Length Mail.dat file in MailStream Plus

Products Affected: MailStream plus
Operating System: IBMi (as400 iSeries)
Yes, you will get both.  
The Variable Length Mail.dat files are produced first, called MVxxxJOBID.  For example MVCCR@IVP@.
The Fixed Length Mail.dat files are then produced from the Variable Length files in addition, called MDxxxJOBID.  For example MDCCR@IVP@.
UPDATED:  April 19, 2017