diff --git a/src/libcore/rt/io/util.rs b/src/libcore/rt/io/extensions.rs
similarity index 100%
rename from src/libcore/rt/io/util.rs
rename to src/libcore/rt/io/extensions.rs
diff --git a/src/libcore/rt/io/file.rs b/src/libcore/rt/io/file.rs
index e041183b5845..4e3e01a5eceb 100644
--- a/src/libcore/rt/io/file.rs
+++ b/src/libcore/rt/io/file.rs
@@ -9,14 +9,10 @@
 // except according to those terms.
 
 use prelude::*;
-use super::misc::PathLike;
+use super::support::PathLike;
 use super::{Reader, Writer, Seek, Close};
 use super::{IoError, SeekStyle};
 
-/// Open a file with the default FileMode and FileAccess
-/// # XXX are there sane defaults here?
-pub fn open_file<P: PathLike>(_path: &P) -> FileStream { fail!() }
-
 /// # XXX
 /// * Ugh, this is ridiculous. What is the best way to represent these options?
 enum FileMode {
diff --git a/src/libcore/rt/io/mod.rs b/src/libcore/rt/io/mod.rs
index b035532144c4..7ab27cdd7ec5 100644
--- a/src/libcore/rt/io/mod.rs
+++ b/src/libcore/rt/io/mod.rs
@@ -104,7 +104,6 @@ pub use self::stdio::stderr;
 pub use self::stdio::print;
 pub use self::stdio::println;
 
-pub use self::file::open_file;
 pub use self::file::FileStream;
 pub use self::net::Listener;
 pub use self::net::ip::IpAddr;
@@ -113,9 +112,9 @@ pub use self::net::tcp::TcpStream;
 pub use self::net::udp::UdpStream;
 
 // Some extension traits that all Readers and Writers get.
-pub use self::util::ReaderUtil;
-pub use self::util::ReaderByteConversions;
-pub use self::util::WriterByteConversions;
+pub use self::extensions::ReaderUtil;
+pub use self::extensions::ReaderByteConversions;
+pub use self::extensions::WriterByteConversions;
 
 /// Synchronous, non-blocking file I/O.
 pub mod file;
@@ -140,10 +139,10 @@ pub mod flate;
 pub mod comm_adapters;
 
 /// Extension traits
-mod util;
+mod extensions;
 
 /// Non-I/O things needed by the I/O module
-mod misc;
+mod support;
 
 /// Thread-blocking implementations
 pub mod native {
diff --git a/src/libcore/rt/io/net/unix.rs b/src/libcore/rt/io/net/unix.rs
index 35eabe21b2a6..de886949e7b0 100644
--- a/src/libcore/rt/io/net/unix.rs
+++ b/src/libcore/rt/io/net/unix.rs
@@ -11,7 +11,7 @@
 use prelude::*;
 use super::*;
 use super::super::*;
-use super::super::misc::PathLike;
+use super::super::support::PathLike;
 
 pub struct UnixStream;
 
diff --git a/src/libcore/rt/io/misc.rs b/src/libcore/rt/io/support.rs
similarity index 100%
rename from src/libcore/rt/io/misc.rs
rename to src/libcore/rt/io/support.rs