diff --git a/Makefile b/Makefile
index 0d638cc..383bbc7 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ LD_FLAGS    := -s -w \
 
 define BUILD_PLATFORM
 	GOOS=$(1) GOARCH=$(2) CGO_ENABLED=0 $(GO) build -ldflags "$(LD_FLAGS)" \
-		-o $(DIST_DIR)/$(BINARY_NAME)-$(1)-$(2) \
+		-o $(DIST_DIR)/$(BINARY_NAME)-$(1)-$(2)$(3) \
 		./cmd/opencodereview
 endef
 
@@ -55,14 +55,10 @@ build-darwin-arm64:
 	$(call BUILD_PLATFORM,darwin,arm64)
 
 build-windows-amd64:
-	GOOS=windows GOARCH=amd64 CGO_ENABLED=0 $(GO) build -ldflags "$(LD_FLAGS)" \
-		-o $(DIST_DIR)/$(BINARY_NAME)-windows-amd64.exe \
-		./cmd/opencodereview
+	$(call BUILD_PLATFORM,windows,amd64,.exe)
 
 build-windows-arm64:
-	GOOS=windows GOARCH=arm64 CGO_ENABLED=0 $(GO) build -ldflags "$(LD_FLAGS)" \
-		-o $(DIST_DIR)/$(BINARY_NAME)-windows-arm64.exe \
-		./cmd/opencodereview
+	$(call BUILD_PLATFORM,windows,arm64,.exe)
 
 build-all: build-linux-amd64 build-linux-arm64 build-darwin-amd64 build-darwin-arm64 build-windows-amd64 build-windows-arm64
 
diff --git a/README.md b/README.md
index 8121e3f..32e073b 100644
--- a/README.md
+++ b/README.md
@@ -90,10 +90,10 @@ chmod +x ocr && sudo mv ocr /usr/local/bin/ocr
 curl -Lo ocr https://github.com/alibaba/open-code-review/releases/latest/download/opencodereview-linux-arm64
 chmod +x ocr && sudo mv ocr /usr/local/bin/ocr
 
-# Windows (x86_64)
+# Windows (x86_64) — move ocr.exe to a directory in your PATH
 curl -Lo ocr.exe https://github.com/alibaba/open-code-review/releases/latest/download/opencodereview-windows-amd64.exe
 
-# Windows (ARM64)
+# Windows (ARM64) — move ocr.exe to a directory in your PATH
 curl -Lo ocr.exe https://github.com/alibaba/open-code-review/releases/latest/download/opencodereview-windows-arm64.exe
 ```
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 571ee75..04b2b3a 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -90,10 +90,10 @@ chmod +x ocr && sudo mv ocr /usr/local/bin/ocr
 curl -Lo ocr https://github.com/alibaba/open-code-review/releases/latest/download/opencodereview-linux-arm64
 chmod +x ocr && sudo mv ocr /usr/local/bin/ocr
 
-# Windows (x86_64)
+# Windows (x86_64) — 将 ocr.exe 移动到 PATH 目录中
 curl -Lo ocr.exe https://github.com/alibaba/open-code-review/releases/latest/download/opencodereview-windows-amd64.exe
 
-# Windows (ARM64)
+# Windows (ARM64) — 将 ocr.exe 移动到 PATH 目录中
 curl -Lo ocr.exe https://github.com/alibaba/open-code-review/releases/latest/download/opencodereview-windows-arm64.exe
 ```
 
diff --git a/internal/release/asset_naming_test.go b/internal/release/asset_naming_test.go
index 1d298d1..807c63c 100644
--- a/internal/release/asset_naming_test.go
+++ b/internal/release/asset_naming_test.go
@@ -141,23 +141,29 @@ func TestMakefileBuildMatchesURLPattern(t *testing.T) {
 	}
 	outputTemplate := m[1]
 
-	platforms := []struct{ os, arch string }{
-		{"linux", "amd64"},
-		{"linux", "arm64"},
-		{"darwin", "amd64"},
-		{"darwin", "arm64"},
+	platforms := []struct{ os, arch, ext string }{
+		{"linux", "amd64", ""},
+		{"linux", "arm64", ""},
+		{"darwin", "amd64", ""},
+		{"darwin", "arm64", ""},
+		{"windows", "amd64", ".exe"},
+		{"windows", "arm64", ".exe"},
 	}
 	for _, p := range platforms {
 		rendered := outputTemplate
 		rendered = strings.ReplaceAll(rendered, "$(BINARY_NAME)", "opencodereview")
 		rendered = strings.ReplaceAll(rendered, "$(1)", p.os)
 		rendered = strings.ReplaceAll(rendered, "$(2)", p.arch)
+		rendered = strings.ReplaceAll(rendered, "$(3)", p.ext)
 
 		url := pkg.OcrConfig.URLPattern
 		url = strings.ReplaceAll(url, "{version}", "1.0.7")
 		url = strings.ReplaceAll(url, "{os}", p.os)
 		url = strings.ReplaceAll(url, "{arch}", p.arch)
 		expected := extractFilenameFromURL(url)
+		if p.ext != "" {
+			expected += p.ext
+		}
 
 		if rendered != expected {
 			t.Errorf("Makefile produces %q, urlPattern expects %q", rendered, expected)
diff --git a/scripts/install.js b/scripts/install.js
index ec76985..d54b8fc 100644
--- a/scripts/install.js
+++ b/scripts/install.js
@@ -240,6 +240,8 @@ if (require.main === module) {
   });
 } else {
   module.exports = {
+    IS_WINDOWS,
+    BINARY_NAME,
     detectPlatform,
     loadPackageJson,
     buildUrl,
diff --git a/scripts/update.js b/scripts/update.js
index 7bc3f9e..9b3a634 100644
--- a/scripts/update.js
+++ b/scripts/update.js
@@ -9,6 +9,8 @@ const https = require("https");
 const { spawnSync } = require("child_process");
 
 const {
+  IS_WINDOWS,
+  BINARY_NAME,
   detectPlatform,
   loadPackageJson,
   buildUrl,
@@ -16,9 +18,6 @@ const {
   downloadBinary,
   computeChecksum,
 } = require("./install.js");
-
-const IS_WINDOWS = process.platform === "win32";
-const BINARY_NAME = IS_WINDOWS ? "opencodereview.exe" : "opencodereview";
 const packageRoot = path.join(__dirname, "..");
 const binDir = path.join(packageRoot, "bin");
 const binaryPath = path.join(binDir, BINARY_NAME);
@@ -197,7 +196,26 @@ async function main() {
       }
     }
 
-    fs.renameSync(tempPath, binaryPath);
+    if (IS_WINDOWS) {
+      const oldPath = binaryPath + ".old";
+      try { fs.unlinkSync(oldPath); } catch (_) {}
+      try {
+        fs.renameSync(binaryPath, oldPath);
+      } catch (e) {
+        if (fs.existsSync(binaryPath)) {
+          throw e;
+        }
+      }
+      try {
+        fs.renameSync(tempPath, binaryPath);
+      } catch (e) {
+        try { fs.renameSync(oldPath, binaryPath); } catch (_) {}
+        throw e;
+      }
+      try { fs.unlinkSync(oldPath); } catch (_) {}
+    } else {
+      fs.renameSync(tempPath, binaryPath);
+    }
   } catch (_) {
     cleanupTemp();
   } finally {