diff --git a/crates/ide-tools/src/archive.rs b/crates/ide-tools/src/archive.rs
index 5318c5f71..5afb35572 100644
--- a/crates/ide-tools/src/archive.rs
+++ b/crates/ide-tools/src/archive.rs
@@ -21,7 +21,8 @@ pub enum ArchiveKind {
 impl ArchiveKind {
     pub fn from_name(name: &str) -> Self {
         let n = name.to_ascii_lowercase();
-        if n.ends_with(".zip") || n.ends_with(".vsix") {
+        // JetBrains' macOS .sit distributions are zip archives.
+        if n.ends_with(".zip") || n.ends_with(".vsix") || n.ends_with(".sit") {
             Self::Zip
         } else if n.ends_with(".tar.gz") || n.ends_with(".tgz") {
             Self::TarGz
@@ -393,6 +394,7 @@ mod tests {
     fn kinds() {
         assert_eq!(ArchiveKind::from_name("a.vsix"), ArchiveKind::Zip);
         assert_eq!(ArchiveKind::from_name("a.ZIP"), ArchiveKind::Zip);
+        assert_eq!(ArchiveKind::from_name("kotlin-server-263.7084.0-aarch64.sit"), ArchiveKind::Zip);
         assert_eq!(ArchiveKind::from_name("a.tar.gz"), ArchiveKind::TarGz);
         assert_eq!(ArchiveKind::from_name("a.tgz"), ArchiveKind::TarGz);
         assert_eq!(ArchiveKind::from_name("zls.tar.xz"), ArchiveKind::TarXz);
diff --git a/crates/ide-tools/src/registry.rs b/crates/ide-tools/src/registry.rs
index 5c05cbe75..6dfcd5df7 100644
--- a/crates/ide-tools/src/registry.rs
+++ b/crates/ide-tools/src/registry.rs
@@ -614,15 +614,25 @@ pub static TOOLS: &[ToolSpec] = &[
         method: Method::Release {
             source: ReleaseSource::GitHub { repo: "Kotlin/kotlin-lsp" },
             assets: &[
+                // Current releases (kotlin-server-*): the CLI distribution is a
+                // .sit on macOS, .tar.gz on Linux and .win.zip on Windows. x64 ships as the
+                // un-suffixed archive, aarch64 as `-aarch64`; the un-suffixed one
+                // comes first in the release notes, which is what the x64 pattern
+                // matches first. Without a matching rule the installer used to fall
+                // through to a loose `kotlin-*.zip` pattern and POSIX picked the
+                // Windows archive (#723).
+                rule(Mac, Arm64, "kotlin-server-*-aarch64.sit"),
+                rule(Mac, X64, "kotlin-server-*.sit"),
+                rule(Linux, Arm64, "kotlin-server-*-aarch64.tar.gz"),
+                rule(Linux, X64, "kotlin-server-*.tar.gz"),
+                rule(Windows, X64, "kotlin-server-*.win.zip"),
+                rule(Windows, Arm64, "kotlin-server-*-aarch64.win.zip"),
+                // Old releases named the archives kotlin-lsp-*.
                 rule(Mac, Arm64, "kotlin-lsp-*-mac-aarch64.zip"),
                 rule(Mac, X64, "kotlin-lsp-*-mac-x64.zip"),
                 rule(Linux, X64, "kotlin-lsp-*-linux-x64.zip"),
                 rule(Linux, Arm64, "kotlin-lsp-*-linux-aarch64.zip"),
                 rule(Windows, X64, "kotlin-lsp-*-win-x64.zip"),
-                // Older releases ship one platform-independent archive.
-                any_arch(Mac, "kotlin-*.zip"),
-                any_arch(Linux, "kotlin-*.zip"),
-                any_arch(Windows, "kotlin-*.zip"),
             ],
             locate: &["kotlin-lsp", "kotlin-lsp.sh", "kotlin-lsp.cmd"],
         },
@@ -988,4 +998,51 @@ mod tests {
             }
         }
     }
+
+    /// The v263 kotlin-server-* release notes: the CLI distribution archives plus
+    /// the VS Code extension and checksums; each platform must pick its native
+    /// distribution and the aarch64 archive must never be picked on x64.
+    #[test]
+    fn kotlin_lsp_picks_the_native_archive_for_each_platform() {
+        use crate::platform::{Platform, select_asset};
+        let names = [
+            "kotlin-server-0.0.27-mac-amd64.vsix",
+            "kotlin-server-0.0.27-mac-amd64.vsix.sha256",
+            "kotlin-server-0.0.27-mac-aarch64.vsix",
+            "kotlin-server-0.0.27-mac-aarch64.vsix.sha256",
+            "kotlin-server-0.0.27-linux-amd64.vsix",
+            "kotlin-server-0.0.27-linux-amd64.vsix.sha256",
+            "kotlin-server-0.0.27-linux-aarch64.vsix",
+            "kotlin-server-0.0.27-linux-aarch64.vsix.sha256",
+            "kotlin-server-0.0.27-win-amd64.vsix",
+            "kotlin-server-0.0.27-win-amd64.vsix.sha256",
+            "kotlin-server-0.0.27-win-aarch64.vsix",
+            "kotlin-server-0.0.27-win-aarch64.vsix.sha256",
+            "kotlin-server-263.7084.0.sit",
+            "kotlin-server-263.7084.0.sit.sha256",
+            "kotlin-server-263.7084.0-aarch64.sit",
+            "kotlin-server-263.7084.0-aarch64.sit.sha256",
+            "kotlin-server-263.7084.0.tar.gz",
+            "kotlin-server-263.7084.0.tar.gz.sha256",
+            "kotlin-server-263.7084.0-aarch64.tar.gz",
+            "kotlin-server-263.7084.0-aarch64.tar.gz.sha256",
+            "kotlin-server-263.7084.0.win.zip",
+            "kotlin-server-263.7084.0.win.zip.sha256",
+            "kotlin-server-263.7084.0-aarch64.win.zip",
+            "kotlin-server-263.7084.0-aarch64.win.zip.sha256",
+        ];
+        let rules = find("kotlin-lsp").unwrap().asset_rules();
+        let mac_arm = Platform { os: Mac, arch: Arm64 };
+        assert_eq!(select_asset(&names, rules, mac_arm), Some("kotlin-server-263.7084.0-aarch64.sit"));
+        let mac_x64 = Platform { os: Mac, arch: X64 };
+        assert_eq!(select_asset(&names, rules, mac_x64), Some("kotlin-server-263.7084.0.sit"));
+        let linux_x64 = Platform { os: Linux, arch: X64 };
+        assert_eq!(select_asset(&names, rules, linux_x64), Some("kotlin-server-263.7084.0.tar.gz"));
+        let linux_arm = Platform { os: Linux, arch: Arm64 };
+        assert_eq!(select_asset(&names, rules, linux_arm), Some("kotlin-server-263.7084.0-aarch64.tar.gz"));
+        let win_x64 = Platform { os: Windows, arch: X64 };
+        assert_eq!(select_asset(&names, rules, win_x64), Some("kotlin-server-263.7084.0.win.zip"));
+        let win_arm = Platform { os: Windows, arch: Arm64 };
+        assert_eq!(select_asset(&names, rules, win_arm), Some("kotlin-server-263.7084.0-aarch64.win.zip"));
+    }
 }