The suffix frequently refers to the 9th revision of an Internet-Draft. If this is related to network protocols or data standards, it may refer to:
If this is a reference to a saved message on a mobile device: 9_7382mp4
Could you clarify if refers to a specific video file or a project code ? Knowing the software or industry you're working in would help in drafting more precise text for you. The suffix frequently refers to the 9th revision