An AJP file labeled .ajp varies in meaning because different systems may generate it, though it’s most often a CCTV/DVR export where video is stored in a proprietary format that regular players can’t handle, created when someone exports a chosen camera and time span to USB or disc, usually accompanied by a special viewer such as a Backup Player / AJP Player that can open the footage and sometimes re-export it.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 substantial in size, often packaged with viewer apps, while project-based AJP files are much smaller 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 is tied to the system that made it because Windows and standard video players won’t open it by default, 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 viewer is bundled, the next step is to figure out the DVR/NVR brand and model—or at least the software used for live viewing—and download the official CMS/VMS/backup viewer from that vendor, since many CCTV systems rely on their own PC client to decode AJP files, and once installed you should open the client first, use its Open/Playback/Local File option to load the AJP, and if it plays but offers no export feature, the final fallback is to screen-record the footage full screen, which isn’t ideal but can be necessary for older locked formats.If the AJP didn’t originate from surveillance equipment, it might be used by outdated animation tools or CAD/CAM software, meaning it requires the original application to open it, so check the surrounding folder for hints such as project-related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 want, you can paste 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.