What is an AEX file?
The primary use of an .AEX file is as an After Effects Plug-in created by Adobe Systems. These files add extra effects, filters, or tools to Adobe After Effects. Structurally, an .AEX plugin often uses the standard EXE or DLL executable format, but it requires the host application to run.
Because the .AEX extension has multiple possible meanings, it can also be an ApplicationXtender exported page file used by OpenText ApplicationXtender, a compiled global functions file for Alpha Software, or an older Adobe PhotoDeluxe clip art library.
How to open AEX files?
You cannot open an .AEX plugin directly by double-clicking it. To use an After Effects Plug-in, you must move the file into the Plug-ins folder of your Adobe After Effects installation directory. The software will load the plugin the next time it starts.
For ApplicationXtender files, you must use the OpenText document management software to view the exported pages.
Best practices and troubleshooting
Because an .AEX file can belong to several different programs, you might not know which software created your specific file. Do not force an unknown .AEX file into your system folders. Instead, viewer.online/aex analyzes .AEX files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Summary
The .AEX file extension is primarily associated with the After Effects Plug-in format by Adobe Systems, but it can represent other data types. Because .AEX files use the known EXE format, viewer.online/aex can safely open and display them online, eliminating compatibility problems.