Supported file protocols:
I.. = Input  supported
.O. = Output supported
..S = Seek   supported
FLAGS NAME
----- 
I..   applehttp
I.S   cache
I.S   concat
I..   crypto
IOS   file
IO.   gopher
IOS   http
IO.   httpproxy
I.S   mmsh
I..   mmst
.O.   md5
IO.   pipe
IO.   rtmp
IO.   rtp
IO.   tcp
IO.   udp
