Open With Plain Text Editor option is missing for .dts files

I am trying to edit a .dts (device tree source) file using Qt Creator, but I only have the options to open the file with the system editor or the binary editor.  This is apparently happening because some program has registered .dts as a DTS audio file.

I could hack the MIME database to remove the file association, but I would rather not have to since my changes could simply be overwritten by a later update.  I can also change the file extension to .dtsi, but that would break my build if I don't rename it back, or I could create a symlink with a .dtsi extension, but that would pollute my source tree.  It would be better if Qt Creator gave the option to open a file with the plain text editor even when the file extension was registered to something that normally wouldn't be plain text.