diff --git a/changelog.d/fixes/0000-windows-compression-tests.md b/changelog.d/fixes/0000-windows-compression-tests.md
new file mode 100644
index 000000000000..6281f3783db5
--- /dev/null
+++ b/changelog.d/fixes/0000-windows-compression-tests.md
@@ -0,0 +1 @@
+- **fix(tests):** Compression worker-pool and RTK TOML test assertions now cross-platform — worker specifier compares URL pathnames via `pathToFileURL`, and the 0600 permission check is POSIX-only. Both failures were Windows-only test bugs, not runtime regressions.
diff --git a/tests/unit/compression/compression-worker-pool-jam.test.ts b/tests/unit/compression/compression-worker-pool-jam.test.ts
index 4bd1a83e3e17..d12c3d464c65 100644
--- a/tests/unit/compression/compression-worker-pool-jam.test.ts
+++ b/tests/unit/compression/compression-worker-pool-jam.test.ts
@@ -1,6 +1,8 @@
 import assert from "node:assert/strict";
 import { EventEmitter } from "node:events";
+import path from "node:path";
 import { after, describe, it } from "node:test";
+import { pathToFileURL } from "node:url";
 import type { Worker } from "node:worker_threads";
 import {
   __setCompressionWorkerFactoryForTests,
@@ -602,7 +604,7 @@ describe("llmlingua worker spawn specifier", () => {
     const specifier = llmlinguaWorkerSpecifier("/app/onnxWorker.js");
     assert.ok(specifier instanceof URL, "Worker entry must be a URL object, not a string");
     assert.equal(specifier.protocol, "file:");
-    assert.equal(specifier.pathname, "/app/onnxWorker.js");
+    assert.equal(specifier.pathname, pathToFileURL(path.resolve("/app/onnxWorker.js")).pathname);
   });
 });
 
diff --git a/tests/unit/compression/rtk-toml-compatibility.test.ts b/tests/unit/compression/rtk-toml-compatibility.test.ts
index cc5b9cacef0c..891c93f08ca3 100644
--- a/tests/unit/compression/rtk-toml-compatibility.test.ts
+++ b/tests/unit/compression/rtk-toml-compatibility.test.ts
@@ -240,7 +240,9 @@ match_command = "^scope-tool"
 
     assert.equal(installed.installedPath, "rtk/filters.toml");
     assert.equal(fs.readFileSync(target, "utf8"), SAMPLE);
-    assert.equal(fs.statSync(target).mode & 0o777, 0o600);
+    if (process.platform !== "win32") {
+      assert.equal(fs.statSync(target).mode & 0o777, 0o600);
+    }
     assert.throws(
       () => installGlobalRtkTomlV1(SAMPLE),
       (error: unknown) =>