Files with hm4 file extension can be found as data backup files from Lorex Client for L19WD Series. Perhaps a little outdated.
HM4 file extension - Lorex backup
What is hm4 file? How to open hm4 files?
File type specification:
The hm4 file extension is used for video-backups created with the Lorex Client for L19WD Series digital surveillance system.
Most likely very rare or obsolete file format without support from developer.
This hm4 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.