Do you think it's time to create a new STX file with all lower case characters?

If the Project was created in S14 & not S12, as you've Posted above:

1) Launch S14.

2) File / New Project

3) File / Save Project

4) In following Pop-up; Save in; My Projects. Leave My Movie.stx "As is". (If the .stx File Extension doesn't show, go to Folder Options / View & uncheck "Hide extensions for known file types).

5) Save.

6) Go to your My Projects Folder. You should have a MY MOVIE Project Folder & it's associated My Movie.stx File with S14 Icon. Not S12 Icon. If yes, delete the original S12 ChristmasCarol12 STX File & MY MOVIE Project Folder. Rename the My Movie.stx File to christmascarol12.stx