diff --git a/demo/web/archive.mjs b/demo/web/archive.mjs
index 20c9584823..23b2051b1a 100644
--- a/demo/web/archive.mjs
+++ b/demo/web/archive.mjs
@@ -18,7 +18,7 @@ class BoundedBlobReader extends BlobReader {
 export function validPath(name) {
   if (!name || name.includes("\\") || /[\x00-\x1f<>:"|?*]/u.test(name)) throw new Error(`Unsafe ZIP path: ${name}`);
   const parts = name.replace(/\/$/u, "").split("/");
-  if (parts.some(part => !part || part === "." || part === ".." || /[. ]$/u.test(part) || /^(con|prn|aux|nul|com[1-9]|lpt[1-9])(?:\.|$)/iu.test(part))) throw new Error(`Unsafe ZIP path: ${name}`);
+  if (parts.some(part => !part || part === "." || part === ".." || /[. ]$/u.test(part) || /^(con|prn|aux|nul|com[1-9\u00b9\u00b2\u00b3]|lpt[1-9\u00b9\u00b2\u00b3])(?:\.|$)/iu.test(part))) throw new Error(`Unsafe ZIP path: ${name}`);
   return name;
 }
 
diff --git a/demo/web/tests/archive-reserved.test.mjs b/demo/web/tests/archive-reserved.test.mjs
new file mode 100644
index 0000000000..b04432d014
--- /dev/null
+++ b/demo/web/tests/archive-reserved.test.mjs
@@ -0,0 +1,31 @@
+import assert from "node:assert/strict";
+import { register } from "node:module";
+import { pathToFileURL } from "node:url";
+import path from "node:path";
+
+register("./cdn-loader.mjs", import.meta.url, { data: { url: process.env.ANYPS5_TEST_ZIP_URL, path: process.env.ANYPS5_TEST_ZIP_PATH } });
+const { Archive, validPath } = await import(pathToFileURL(path.join(process.argv[2], "archive.mjs")));
+const { BlobWriter, Uint8ArrayReader, ZipWriter } = await import(process.env.ANYPS5_TEST_ZIP_URL);
+const header = new Uint8Array([127, 69, 76, 70]);
+
+for (const prefix of ["COM", "lpt"]) {
+  for (const digit of ["\u00b9", "\u00b2", "\u00b3"]) {
+    for (const name of [prefix + digit, prefix + digit + ".txt", "content/" + prefix + digit + "/data.bin"]) {
+      assert.throws(() => validPath(name), /Unsafe ZIP path/);
+      const folder = new Archive([{ path: "main.elf", file: new Blob([header]) }, { path: name, file: new Blob(["resource"]) }]);
+      try { await assert.rejects(folder.inspect(() => {}), /Unsafe ZIP path/); }
+      finally { await folder.close(); }
+    }
+  }
+}
+
+const writer = new ZipWriter(new BlobWriter(), { useWebWorkers: false, useCompressionStream: false });
+await writer.add("main.elf", new Uint8ArrayReader(header));
+await writer.add("content/COM\u00b9.txt", new Uint8ArrayReader(new Uint8Array([1])));
+const archive = new Archive(await writer.close());
+try { await assert.rejects(archive.inspect(() => {}), /Unsafe ZIP path/); }
+finally { await archive.close(); }
+
+for (const name of ["COM10", "COM\u2074.txt", "COM\u00b9-extra", "content/ordinary.txt"]) {
+  assert.equal(validPath(name), name);
+}
diff --git a/demo/web/tests/archive.test.mjs b/demo/web/tests/archive.test.mjs
index 4470741f74..2ad5bce8eb 100644
--- a/demo/web/tests/archive.test.mjs
+++ b/demo/web/tests/archive.test.mjs
@@ -9,6 +9,7 @@ register("./cdn-loader.mjs", import.meta.url, { data: { url: process.env.ANYPS5_
 const site = name => pathToFileURL(path.join(process.argv[2], name)).href;
 const { Archive, memoryEstimate, MEMORY_LIMIT, packageArchive } = await import(site("archive.mjs"));
 const { BlobReader, BlobWriter, Uint8ArrayReader, Uint8ArrayWriter, ZipReader, ZipWriter } = await import(process.env.ANYPS5_TEST_ZIP_URL);
+await import("./archive-reserved.test.mjs");
 const { default: createRelinker } = await import(site("native/relinker_wasm.mjs"));
 const native = await createRelinker();
 const executable = new Uint8Array(await readFile(path.join(process.argv[3], "main.elf")));