I am using SSMS 2012. I am working with .PRC, .TAB, and .UDF files. I added these file extensions to SSMS so that it would treat them like .SQL files already via Tools > Options > Text Editor > File Extension, but recently SSMS has stopped recognizing these files (e.g. won't show them with color coding or allow me to run them against a database). Funnily enough when I remove a file extension from a file it then recognizes them because it has "Map extensionless files to SQL Query Editor" checked.
Does anyone know what the problem might be?