Sometimes "AJB" refers to specific journals (like the American Journal of Botany ) or legal identifiers, though it's rare for these to be distributed as MP4s without further context.

If you downloaded this from a specific platform (e.g., a university portal, a cloud drive, or a forum), returning to the parent folder or the original post usually provides the context or "guide" you need.

Internal training videos sometimes use these codes. How to Find Your Specific Video

It may be a specific part of a larger video collection or a re-uploaded file (where "202" indicates a part number or a copy).