CreateEditorInstance returns this value if the document has a format that cannot be opened in the editor.
Assembly: Microsoft.VisualStudio.Shell.9.0 (in Microsoft.VisualStudio.Shell.9.0.dll)
When looping through CreateEditorInstance to find an appropriate editor to edit a file, if the file is currently open, returning will allow the loop to continue without closing the document.
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.