Files with hgz file extension might be found as one of the GIS files from ArcMap software.
Software that open hgz file
HGZ file extension - ArcMap GIS data
What is hgz file? How to open hgz files?
File type specification:
The hgz file extension seems to be used for one of the GIS files from ArcMap or ArcView. The hgz file is used for mapping purposes and contains GIS related data.
The default software associated to open hgz file:
ArcGIS for Desktop Basic (ArcView) 
Company or developer:
Esri
ArcGIS for Desktop Basic (formerly known as ArcView) is GIS (geographic information system) application used to visualizing, managing, creating, and analyzing geographic data.
ArcGIS for Desktop Basic is a part of the ArcGIS Desktop. ArcGIS for Desktop Basic supports creation of interactive maps, spatial analysis, GIS deployment, map viewing and navigation, map printing etc.
List of software applications associated to the .hgz 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 hgz file, edit hgz file, convert hgz file, view hgz file, play hgz 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 hgz files.
Software that open hgz file - ArcMap GIS data
Programs supporting the exension hgz on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcGIS for Desktop Basic (ArcView) for open hgz file action.
