tathamoddie/System.IO.Abstractions — pull request #75 by ericnewton76 (2014-03-17 16:58:45+00:00)
Title: made all File.Open methods mimic core framework semantics as closely as possible

The current implementation had "Please implement" exceptions, so I investigated how the core framework utilizes File.Open and realigned them as closely as possible with the core framework semantics.