Files with dlg extension are used by the ArcView software. They include graph's data.
There are 6 other file types using
the DLG file extension!
.dlg - Microsoft Windows dialogue resource script
.dlg - Digital Line Graph vector image
.dlg - Bioware Infinity and Aurora game engines dialog
.dlg - C++ dialogue script
.dlg - MicroSim PCBoard NC drill descriptive data
.dlg - Crysis dialogue data
DLG file extension - ArcView graph file
What is dlg file? How to open dlg files?
File type specification:
The dlg file extension is associated with the ArcView (ArcGIS for Desktop Basic) a geospatial analyzing software for Microsoft Windows operating system. The .dlg file stores graph created in the ArcView.
The default software associated to open dlg 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 .dlg 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 dlg file, edit dlg file, convert dlg file, view dlg file, play dlg 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 dlg files.
Software that open dlg file - ArcView graph file
Programs supporting the exension dlg on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open dlg file action.
Microsoft Windows:
Main software associated with dlg file by default:
ArcGIS for Desktop Basic (ArcView)
Other suggested software:
ArcGIS
