An AJP file noted as .ajp is only defined by what produced it, most commonly a CCTV/DVR export storing video in a proprietary format that is incompatible with VLC/WMP, 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 originate from 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 often extremely large and may be accompanied by a viewer program, while project-oriented AJP files are smaller 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.

To open an .AJP file, the correct procedure differs depending on its source because common players and Windows don’t know how to read it, and for CCTV/DVR exports the most dependable approach is to run the bundled viewer/player—often found alongside the AJP under names like Player. If you are you looking for more on AJP file structure review the website. exe or BackupPlayer.exe—use it to load the footage, and then choose its Export/Save/Convert option to create a standard format such as MP4 or AVI.

If nothing came with the AJP file, your best move is to look up the DVR/NVR brand or the software normally used for live viewing, then install the vendor’s official CMS/VMS/backup player, because many systems only decode AJP through their own client; after installation, open that client manually and use its Open/Playback/Local File function to load the AJP, and if playback works but export is unavailable, the last workaround is a full-screen screen recording, which is time-consuming but sometimes unavoidable.

If the file wasn’t produced by a camera system, it may serve as a saved/project file for older animation tools or CAD/CAM platforms, which means it opens only through the original application, so investigate nearby files for names or extensions that reveal its creator, install that software, and open the file from within it, remembering that small files generally suggest project data while very large ones point to DVR exports.

If you want, you can share the file size and a few filenames from the same folder as the AJP—or even provide a quick screenshot—and with that information I can usually tell if it’s a DVR export and suggest the most likely viewer/player that will open it.