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 typical software won’t play, 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 come from a camera system, it may show up as a project/save file from older tools like Anfy Applet Generator for Java-based website animations or appear in CAD/CAM contexts such as Alphacam, meaning it isn’t video, and you can usually identify which kind you have by checking file size and nearby files—CCTV exports are typically hundreds of MB to GB and may sit beside backup utilities or viewer executables, while project-style AJP files are generally lighter and appear with website or CAD/CAM assets, and a quick check of the file’s Properties or a safe peek in a text editor (without saving) can reveal readable text for project/config files versus mostly unreadable binary data for DVR containers.

To open an .AJP file, the correct method depends entirely on the software or device that created it, since Windows and common media players usually fail to guess the proper format, and if the file came from a CCTV/DVR export, the most reliable option is to use the matching viewer/player that accompanies that DVR system, typically found in the same USB/CD/DVD/folder as the AJP and named something like Player.exe, BackupPlayer.exe, or AJPPlayer.exe, which you can run to load the file and then use its own export or convert feature to produce a standard MP4 or AVI.

If no matching viewer is provided, you should check the DVR brand and download the official CMS/VMS or backup viewer, since many CCTV vendors restrict AJP playback to their own client; open the client first, use its Open/Playback/Local File menu to select the AJP, and if the file plays but cannot be exported, the last possible solution is screen-recording the playback, which can degrade quality but may be the only option with older formats.

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 like, simply share the AJP’s size and list a few of the files in the same folder—or share a screenshot—and I can typically see if it’s a surveillance export and recommend the most likely working player.