ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Core Namespace / ProBasedApp Class / ProjectFileExtension Property

ProjectFileExtension Property (ProBasedApp)
Gets the extension of the project file
Syntax
public abstract string ProjectFileExtension {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.4 or higher.
See Also