An flm file extension is related to the Filmline and used for its document files.
FLM file extension - Filmline document
What is flm file? How to open flm files?
File type specification:
The flm file extension was associated with Filmline document file format.
It was developed by BSn and JFF (German Intitute for Children's Film and Television) for interchange of mediagraphic records and as a basis for database publishing for their printed film catalogue1.
In a modified form it also provides the interchange format for the German National DVB project as DVBLINE.
This flm file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.