Save-to-Disk Template Drop-Down List

This may seem like a silly question, but how do I remove items from a drop down list? Specifically the Save-to-Disk Template drop down in Preferences->Save to Disk.

I finally have the two or three templates I like tweaked and tested and I would like to remove all the other template entries that I created along the way.

I've looked around in the documentation and the forum and haven't found anything that addresses this. Is this possible?

Thanks