File ME 1686 sounds promising indeed, although not readily found online.
Location given as (nr) Pernitz. See
https://catalog.archives.gov/id/91176981
Also see
https://catalog.archives.gov/id/207181770?objectPage=65 in which it is stated that no air crashes took place there, but not sure if only US air losses are meant.
Whole document may be of interest for you...
Leendert