MI Pro 12. 0 UT does not display all possible Writer formats when initially opened - the drop down only displays MapInfo .tab/.mfal as an option.
Possible causes are due to the Universal Translator's cache of the items in the list that need to be refreshed.
ResolutionUPDATED: December 3, 2019
To resolve, click on the ellipsis button (3 dots) to refresh the writable formats.