This will show you all of the file names of all the files in that location. Type ren "FILENAME.OLD-EXTENSION" "FILENAME.NEW- EXTENSION" with the filename as the name of the file and the old extension ...
Spraying a vinegar solution onto an already-frozen windshield won't help, the Farmers' Almanac says, and its use could even hurt your vehicle because vinegar can corrode chrome and paint.