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VSConstants.GUID_ItemType_PhysicalFile Field

A GUID constant used to specify that the type is a physical file on disk or the Web.

Namespace:  Microsoft.VisualStudio
Assembly:  Microsoft.VisualStudio.Shell.10.0 (in Microsoft.VisualStudio.Shell.10.0.dll)

public static readonly Guid GUID_ItemType_PhysicalFile

To return the file path use

GetMkDocument(UInt32, String)