diff --git a/crates/aqua-registry/src/types.rs b/crates/aqua-registry/src/types.rs
index 4a04e160ac..87c4c52580 100644
--- a/crates/aqua-registry/src/types.rs
+++ b/crates/aqua-registry/src/types.rs
@@ -611,13 +611,16 @@ impl AquaPackage {
     }
 
     /// Apply Windows executable extension to an asset or URL string if appropriate.
-    /// Mirrors upstream aqua's `completeWindowsExtToAsset` decision tree.
+    /// Keeps already-extended raw assets unchanged to avoid doubling custom Windows extensions.
     fn complete_windows_ext_to_asset(&self, s: &str, v: &str, os: &str) -> Result<String> {
         if os != "windows" || s.ends_with(".exe") || s.ends_with(".jar") {
             return Ok(s.to_string());
         }
         if self.format == "raw" {
-            return Ok(self.complete_windows_ext(s));
+            if self.os_file_ext_is_empty(s, v) {
+                return Ok(self.complete_windows_ext(s));
+            }
+            return Ok(s.to_string());
         }
         if !self.format.is_empty() {
             return Ok(s.to_string());
@@ -1501,6 +1504,20 @@ packages:
         assert_eq!(url, "https://example.com/tool/1.0.0/tool.jar");
     }
 
+    #[test]
+    fn test_url_raw_preserves_custom_windows_ext() {
+        let pkg = AquaPackage {
+            url: "https://example.com/tool/{{.Version}}/tool.bat".to_string(),
+            format: "raw".to_string(),
+            windows_ext: ".bat".to_string(),
+            ..Default::default()
+        };
+
+        let url = pkg.url("1.0.0", "windows", "amd64").unwrap();
+
+        assert_eq!(url, "https://example.com/tool/1.0.0/tool.bat");
+    }
+
     #[test]
     fn test_asset_appends_format_ext_by_default() {
         let pkg = AquaPackage {
@@ -1542,6 +1559,20 @@ packages:
         assert_eq!(asset, "tool-1.0.0-windows-amd64.bat");
     }
 
+    #[test]
+    fn test_asset_raw_preserves_custom_windows_ext() {
+        let pkg = AquaPackage {
+            asset: "tool-{{.Version}}-{{.OS}}-{{.Arch}}.bat".to_string(),
+            format: "raw".to_string(),
+            windows_ext: ".bat".to_string(),
+            ..Default::default()
+        };
+
+        let asset = pkg.asset("1.0.0", "windows", "amd64").unwrap();
+
+        assert_eq!(asset, "tool-1.0.0-windows-amd64.bat");
+    }
+
     #[test]
     fn test_asset_normalizes_custom_windows_ext() {
         let pkg = AquaPackage {