An AJP file .ajp can vary widely by source, most commonly a CCTV/DVR export storing video in a proprietary format that common media tools can’t open, created when someone exports footage from a chosen camera and timeframe to removable media, and usually accompanied by a special viewer like a Backup Player / AJP Player that can open and occasionally convert it.
If an AJP doesn’t come from a DVR or camera system, it may relate to older software like Anfy Applet Generator or CAD/CAM processes such as Alphacam, meaning it isn’t video, and the easiest way to identify which type it is involves looking at size and folder context—CCTV AJP files are huge and may be accompanied by a viewer program, while project-oriented AJP files are relatively modest and appear with web or CAD materials, and checking Properties or doing a non-destructive text-editor peek can differentiate readable project text from binary DVR data.

If the AJP came without a viewer, the next logical step is to check which software manages the system and install the vendor’s CMS/VMS/backup viewer, since many systems decode AJP only through their own PC client; once set up, open the client itself and load the AJP via its Open/Playback/Local File feature, and if playback works but exporting doesn’t, your final fallback is to record the footage from the screen, which is not ideal but can be necessary for older or locked-down formats.
If your AJP isn’t linked to CCTV footage, it could have been created by old animation/applet generators or CAD/CAM systems, which must be opened with their respective software, so scan the folder for app identifiers, documentation, or CAD-style files and then load the AJP inside the appropriate program, using the file size as a quick clue—large indicates CCTV, small indicates project/config data.
If you’d like, just provide the file size along with a few of the neighboring filenames (or a simple screenshot), and I can usually figure out if it’s from a DVR and point you toward the player that’s most likely to work.
