What file extension does a portable map and data package use?

The file extension for a portable map and data package is .mpkx. This extension indicates that the file is a packaged map file, which is a compressed collection of map data that can include everything necessary to share a map, including layers, styles, and data sources in a single file. The .mpkx format is an enhancement over the older .mpk format, offering increased capabilities, such as support for additional data types and user-friendly features that assist in accessing and using the content.

The other options represent different types of files in GIS. For instance, .mpk is an older format for map packages that lacks some of the functionalities of .mpkx, while .pmx is not a commonly recognized extension for GIS data. The .gdb extension denotes a geodatabase, which is a storage system for geographic data but does not encompass the portable map package functionality. Understanding these distinctions is crucial for effectively managing and sharing GIS data in ArcGIS Pro.