New Post: How to OpenRead in WP 8.1

Dim fs As System.IO.Stream = ???OpenRead???("MyFolder/MyBuildActionContentFile.zip")
Dim archive = SharpCompress.Archive.ArchiveFactory.Open(fs)
For i As Integer = 0 To archive.Entries.Count - 1
   If Not archive.Entries(i).IsDirectory Then
       If archive.Entries(i).Key.Contains("TheFileImLookingFor.txt") Then
           Dim zipStream As System.IO.Stream = archive.Entries(i).OpenEntryStream
           Dim myStreamReader As New IO.StreamReader(zipStream)
           Return myStreamReader.ReadToEnd()
           Exit For
        End If
    End If
Next