[Vuejs]-WebStorm File association system does not recognize a file

Looks like you have created that file using wrong action or made a mistake during that process, e.g.:

• used File | New | File...
• did not enter the file extension there (only file name part) .. or that was a wrong yet unknown extension
• then in the popup dialog just automatically pressed Enter.

Solution:

1. Settings/Preferences | Editor | File Types
2. Check the following file type entries:
   • Auto-detect file type by content
   • Text
   • Files opened in associated applications (not your case here)
3. Locate and remove unwanted pattern: will be SetupObjects.vue or very similar to that.

Source (PhpStorm Forums thread, a bit more details)