Opens a read-only stream for the file that is selected by the user using OpenFileDialog.
Assembly: PresentationFramework (in PresentationFramework.dll)
The file is opened with read-only permission (Open, Read, and Read), whether or not the Read Only checkbox is checked in the dialog. Because the file is opened without the ability to overwrite or write to the file, an application can safely load a file while executing within partial trust restrictions.
If more than one file is selected, the first selected file is opened.