An AJP file in the .ajp format varies with its source, most often acting as a CCTV/DVR backup where the device stores video in a proprietary container that is unreadable in VLC or WMP, produced when a user exports a selected channel and time window to a USB stick or disc, and commonly bundled with or requiring a viewer such as a Backup Player / AJP Player to access or convert the footage.

If an AJP file didn’t originate from DVR footage, it may be used by old software like Anfy Applet Generator or CAD/CAM applications such as Alphacam, so it’s not video, and you can usually pinpoint the type by looking at file size and folder structure—CCTV AJPs are massive, often accompanied by viewer programs, whereas project-style AJPs are relatively small and stored next to web or CAD resources, and by checking Properties or safely viewing it in a text editor, readable text hints at a project/config file while mostly unreadable symbols indicate a binary DVR container.

To open an .AJP file, the right solution depends on its origin because Windows and everyday media players won’t open AJP formats on their own, and when the file is from a CCTV/DVR backup, the safest method is to launch the bundled viewer/player—often included in the same export folder and named something like Player.exe or BackupPlayer.exe—then load the AJP inside that tool and use its built-in export or convert option to obtain a normal video file like MP4 or AVI.

If the AJP came without a viewer, the next logical step is to determine the DVR/NVR model 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If the AJP didn’t originate from surveillance equipment, it might be used by outdated animation tools or CAD/CAM software, meaning it requires the original application to open it, so check the surrounding folder for hints such as project-related filenames, readmes, or CAD formats like DXF/DWG, then install the correct program and open the file through it, noting that smaller sizes usually fit project files while very large sizes resemble CCTV containers.

If you prefer, you can give me the file size along with names of nearby files or a screenshot, and I can almost always identify the correct type and advise which playback tool will open it.