must be local file (accessible via FILE*).
It has all features including GetSize and seeking.
+\wxheading{Note}
+
+If you need to enumerate files in ZIP archive, you can use
+\helpref{wxFileSystem}{wxfilesystem} together with wxZipFSHandler (see
+\helpref{the overview}{fs}.
+
+
\wxheading{Derived from}
\helpref{wxInputStream}{wxinputstream}