.FTMX File Extension
What is an FTMX file?
Template created by Finale, a music notation application; contains a template with pre-loaded or customized settings and music notation, such as measures and keys; new version of the original Finale Template .FTM file.
To create a FTMX file simply select File → Save As... with your customized document open, choose your save location (a helpful location is the Finale/Templates folder), name the file, select the FTMX file type, and click Save.
To open a FTMX file, select File → New → Document from Template and double-click on your FTMX file.
NOTE: After the release of Finale 2014, the program began to use FTMX files.