For me this began in Patch 74.
When I double click on a film file from Explorer:
The film viewer software executes but when it tries to load the file I get "AHFilm.exe has stopped working".
However. When I bring up the film viewer first, then load a film via the film viewer program, all is well.
I verified that the file type was pointing to the alpha film viewer. This seem sufficiently weird to warrant a report.