diff --git a/Cargo.lock b/Cargo.lock
index 84f3a3a0a3..15df8fcd66 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -206,26 +206,36 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
 [[package]]
-name = "cap-primitives"
-version = "0.6.0"
+name = "cap-fs-ext"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9069ed88e23a3fff56577518a238e6975920620cd5d00be8ca73aa46a96d5f5"
+checksum = "724c2735539ad3ab51f04a0d84bca8c23398e558e810254a6996867fd6c7db81"
+dependencies = [
+ "cap-primitives",
+ "cap-std",
+]
+
+[[package]]
+name = "cap-primitives"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b599a2508a28113d658c2f94f3d294d8023c3b34adb89204d7744ddbeb22a59"
 dependencies = [
  "errno",
  "fs-set-times",
  "ipnet",
  "libc",
  "once_cell",
- "posish 0.4.1",
+ "posish 0.5.2",
  "winapi",
- "winx 0.20.0",
+ "winx 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cap-std"
-version = "0.6.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eacf34fea6948253011b8771b7ae6258a2ae15c7ba38e78b7dd60a785af354d2"
+checksum = "0760daa4e6270daa9c5c6ad133108fb77edfe023a019c392d98dd769defa42d5"
 dependencies = [
  "cap-primitives",
 ]
@@ -2367,12 +2377,12 @@ name = "wasi-c2"
 version = "0.21.0"
 dependencies = [
  "anyhow",
+ "cap-fs-ext",
  "cap-std",
  "cfg-if 1.0.0",
  "fs-set-times",
  "getrandom 0.2.0",
  "libc",
- "rustc_version",
  "system-interface",
  "thiserror",
  "tracing",
@@ -2906,17 +2916,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
-[[package]]
-name = "winx"
-version = "0.20.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b25e4ae373f2f2f7f5f187974ed315719ce74160859027c80deb1f68b3c0c966"
-dependencies = [
- "bitflags",
- "cvt",
- "winapi",
-]
-
 [[package]]
 name = "winx"
 version = "0.21.0"
diff --git a/crates/wasi-c2/Cargo.toml b/crates/wasi-c2/Cargo.toml
index 07c64161f9..14324dd229 100644
--- a/crates/wasi-c2/Cargo.toml
+++ b/crates/wasi-c2/Cargo.toml
@@ -21,13 +21,11 @@ getrandom = { version = "0.2.0", features = ["std"] }
 wiggle = { path = "../wiggle", default-features = false, version = "0.21.0" }
 tracing = "0.1.19"
 system-interface = "0.2"
-cap-std = "0.6"
+cap-std = "0.7"
+cap-fs-ext = "0.7"
 fs-set-times = "0.2.1"
 cfg-if = "1"
 
-[build-dependencies]
-rustc_version = "0.2"
-
 [badges]
 maintenance = { status = "actively-developed" }
 
diff --git a/crates/wasi-c2/build.rs b/crates/wasi-c2/build.rs
index 05a4560403..fdb3f82111 100644
--- a/crates/wasi-c2/build.rs
+++ b/crates/wasi-c2/build.rs
@@ -5,14 +5,4 @@ fn main() {
     let wasi = cwd.join("..").join("wasi-common").join("WASI");
     println!("cargo:wasi={}", wasi.display());
     println!("cargo:rustc-env=WASI_ROOT={}", wasi.display());
-
-    match rustc_version::version_meta()
-        .expect("query rustc release channel")
-        .channel
-    {
-        rustc_version::Channel::Nightly => {
-            println!("cargo:rustc-cfg=nightly");
-        }
-        _ => {}
-    }
 }
diff --git a/crates/wasi-c2/src/file.rs b/crates/wasi-c2/src/file.rs
index 19a51db1c2..4acfbd2f87 100644
--- a/crates/wasi-c2/src/file.rs
+++ b/crates/wasi-c2/src/file.rs
@@ -177,14 +177,16 @@ impl WasiFile for cap_std::fs::File {
         if meta.is_file() {
             Ok(Filetype::RegularFile)
         } else {
-            Err(Error::Badf) // XXX idk what to do here
+            todo!("get_filetype doesnt know how to handle case when not a file");
         }
     }
     fn get_fdflags(&self) -> Result<FdFlags, Error> {
         // XXX cap-std doesnt expose append, dsync, nonblock, rsync, sync
-        todo!()
+        todo!("get_fdflags is not implemented")
     }
     fn get_oflags(&self) -> Result<OFlags, Error> {
+        #![allow(unreachable_code, unused_variables)]
+        todo!("get_oflags implementation is incomplete");
         // XXX what if it was opened append, async, nonblock...
         let perms = self.metadata()?.permissions();
         if perms.readonly() {
@@ -210,27 +212,12 @@ impl WasiFile for cap_std::fs::File {
     }
     fn get_filestat(&self) -> Result<Filestat, Error> {
         let meta = self.metadata()?;
-        let (device_id, inode, nlink) = {
-            cfg_if! {
-                if #[cfg(unix)] {
-                    use std::os::unix::fs::MetadataExt;
-                    (meta.dev(), meta.ino(), meta.nlink())
-                } else if #[cfg(all(windows, feature = "nightly"))] {
-                    use std::os::windows::fs::MetadataExt;
-                    ( meta.volume_serial_number().unwrap_or(-1),
-                      meta.file_index().unwrap_or(-1),
-                      meta.number_of_links().unwrap_or(0),
-                    )
-                } else {
-                    (-1, -1, 0)
-                }
-            }
-        };
+        use cap_fs_ext::MetadataExt;
         Ok(Filestat {
-            device_id,
-            inode,
+            device_id: meta.dev(),
+            inode: meta.ino(),
             filetype: self.get_filetype()?,
-            nlink,
+            nlink: meta.nlink(),
             size: meta.len(),
             atim: meta.accessed()?.into_std(),
             mtim: meta.modified()?.into_std(),