ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Core Namespace / ProBasedApp Class / ProjectFileExtension Property
Version

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

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also