An AJP file .ajp may refer to multiple formats depending on what created it, so its origin is the key clue, with the most common case being CCTV/DVR backups where the system saves recorded footage in a proprietary container that standard media apps won’t play, produced when a user selects a camera and time range to export, usually writing the file to a USB stick or disc along with a viewer like a Backup Player or AJP Player that can play the footage and sometimes convert it to a standard format.

If it didn’t originate from a camera system, an AJP file may instead represent a project file from older tools like Anfy Applet Generator or be tied to CAD/CAM platforms such as Alphacam, in which case it has nothing to do with video, and you can narrow it down by reviewing file size and folder contents—CCTV versions are hundreds of MB or GB, often packaged with viewer apps, while project-based AJP files are generally small and live among web or CAD resources, and by checking Properties or safely viewing it in a text editor, readable text usually signals a project/config file while unreadable binary points to DVR footage.

To open an .AJP file, the proper step varies by its source because Windows and standard video players don’t identify it correctly, and if yours came from a DVR export, the recommended solution is to look in the same export directory for the included playback tool—names like Player.exe, BackupPlayer.exe, or AJPPlayer.exe—launch it, load the AJP, and then use its export/convert feature to obtain a normal MP4 or AVI file.

If no bundled player exists, the next approach is checking what device generated it so you can download the correct CMS/VMS or backup viewer, since many CCTV formats only decode within their manufacturer’s client; once installed, launch the client first and select Open/Playback/Local File to load the AJP, and if you can watch it but can’t export it, your last-resort option is to record the playback on screen, which takes extra time but may be necessary.

If your AJP didn’t come from a camera system, it may originate from an older project/animation tool or a CAD/CAM workflow, meaning it opens only in the software that created it, so the best approach is to inspect the source folder for clues—such as app names, readme files, project folders, or CAD-related extensions like DXF/DWG—then install that application and load the AJP from within it, using file size as a hint since large files usually indicate CCTV footage while smaller ones suggest project/config data.

If you prefer, you can tell me the size along with names of nearby files or a screenshot, and I can almost always confirm if it’s a DVR export and advise which playback tool will open it.