What is an MPK file?
An .MPK file is most commonly an ArcGIS Map Package created by ESRI software. It stores map documents, referenced spatial data, and properties in a single file. This allows users to share complete mapping projects easily. Technically, these files are compressed archives that use the 7z compression format.
Other software also uses the .MPK extension. An .MPK file can be a visual novel game archive for the KiriKiri engine, a module package for Mendix (using the ZIP format), an N64 controller save file for Project64, or an expansion pack for Medeli electronic keyboards.
How to open MPK files?
Because .MPK has multiple possible meanings, we recommend using viewer.online/mpk to identify the actual format of your file. viewer.online/mpk analyzes .MPK files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
If your file is a map package, you can open it with ArcGIS Pro. If your file is a Mendix module, you must import it using Mendix Studio Pro.
Best practices and troubleshooting
If you cannot open an ArcGIS Map Package normally, you can manually extract the data. Rename the .MPK extension to .7z and extract the contents using an archive tool like 7-Zip. You can do the same for Mendix modules by renaming the extension to .zip.
Always verify the source of an .MPK file before extracting it. Because these files are often standard archives, they can contain hidden scripts or executables.
Summary
An .MPK file is usually an ArcGIS Map Package created by ESRI, but it can belong to several other programs. Because .MPK files use the known 7z format, viewer.online/mpk can safely open and display them online, eliminating compatibility problems.