An aep file extension is related to the ArcExplorer a free viewer of ESRI map files.
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.AEP file extension - ArcExplorer project
What is aep file? How to open aep files?
File type specification:
The aep file extension is associated with the ArcExplorer, a free viewer of ESRI map files and GIS data files created by other ESRI applications.
The aep file contains saved project for the ArcExplorer.
The default software associated to open aep file:
ArcExplorer 
(obsolete software)
Company or developer:
Esri
ArcExplorer is a lightweight GIS data viewer developed by ESRI. This freely available software offers an easy way to perform a variety of basic GIS functions, including display, query, and data retrieval applications. The program was eventually replaced by the ArcGIS Explorer.
List of software applications associated to the .aep file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open aep file, edit aep file, convert aep file, view aep file, play aep file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting aep files.
Software that open aep file - ArcExplorer project
Programs supporting the exension aep on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcExplorer for open aep file action.
Microsoft Windows:
ArcExplorer (obsolete/discontinued)
