diff --git a/core/startos/src/registry/os/asset/get.rs b/core/startos/src/registry/os/asset/get.rs
index 0d63435f2..a3da7047c 100644
--- a/core/startos/src/registry/os/asset/get.rs
+++ b/core/startos/src/registry/os/asset/get.rs
@@ -138,9 +138,15 @@ async fn cli_get_os_asset(
         ..
     }: HandlerArgs<CliContext, CliGetOsAssetParams>,
 ) -> Result<RegistryAsset<Blake3Commitment>, Error> {
+    let ext = method
+        .iter()
+        .last()
+        .or_else(|| parent_method.iter().last())
+        .unwrap_or(&"bin");
+
     let res = from_value::<RegistryAsset<Blake3Commitment>>(
         ctx.call_remote::<RegistryContext>(
-            &parent_method.into_iter().chain(method).join("."),
+            &parent_method.iter().chain(&method).join("."),
             json!({
                 "version": version,
                 "platform": platform,
@@ -152,6 +158,7 @@ async fn cli_get_os_asset(
     res.validate(SIG_CONTEXT, res.all_signers())?;
 
     if let Some(download) = download {
+        let download = download.join(format!("startos-{version}_{platform}.{ext}"));
         let mut file = AtomicFile::new(&download, None::<&Path>)
             .await
             .with_kind(ErrorKind::Filesystem)?;