diff --git a/news/changelog-1.11.md b/news/changelog-1.11.md
index e1b823c6e9..d59f97b3e6 100644
--- a/news/changelog-1.11.md
+++ b/news/changelog-1.11.md
@@ -192,3 +192,4 @@ All changes included in 1.11:
 - ([#15126](https://github.com/quarto-dev/quarto-cli/issues/15126)): Translate the `revealjs-menu-button-label` language key in French. (author: @D3ller)
 - ([#15140](https://github.com/quarto-dev/quarto-cli/pull/15140)): Add support for definition lists written as a `definition-list` div holding a nested bullet list, the definition list syntax of Quarto 2.
 - ([#15180](https://github.com/quarto-dev/quarto-cli/pull/15180)): Fix older Quarto versions failing to render with `RangeError: could not deserialize value` once a Quarto built on a newer Deno has used the same cache. Also fix a project cache that already has entries failing to clear with `Path must be a string`.
+- ([#15198](https://github.com/quarto-dev/quarto-cli/issues/15198)): Fix `quarto add`, `quarto use template`, `quarto use brand` and `quarto install tinytex` failing to unzip on Windows when a Group Policy blocks running `.bat` files from the temporary folder, and when a path contains an apostrophe.
diff --git a/src/core/zip.ts b/src/core/zip.ts
index 8ed23ddde5..0b18dd011f 100644
--- a/src/core/zip.ts
+++ b/src/core/zip.ts
@@ -7,45 +7,43 @@ import { dirname } from "../deno_ral/path.ts";
 import { existsSync } from "../deno_ral/fs.ts";
 import { isWindows } from "../deno_ral/platform.ts";
 import { execProcess } from "./process.ts";
-import { safeWindowsExec } from "./windows.ts";
+
+// Quote a value as a PowerShell single-quoted string literal. PowerShell
+// treats ' and the curly quotes ‘ ’ ‚ ‛ all as single quotes; each is
+// escaped by doubling it.
+function powershellLiteral(value: string) {
+  return `'${value.replace(/['‘’‚‛]/g, "$&$&")}'`;
+}
 
 export function unzip(file: string, dir?: string) {
   if (!dir) dir = dirname(file);
 
+  // Windows extraction launches executables directly, without a temporary
+  // .bat: Group Policy can block running .bat files from %TEMP% (#15198)
   if (isWindows && file.endsWith(".exe")) {
     // Self-extracting 7z archive (e.g., TinyTeX-windows.exe)
-    return safeWindowsExec(
-      file,
-      ["-y"],
-      (cmd: string[]) => {
-        return execProcess({
-          cmd: cmd[0],
-          args: cmd.slice(1),
-          cwd: dir,
-          stdout: "piped",
-        });
-      },
-    );
+    return execProcess({
+      cmd: file,
+      args: ["-y"],
+      cwd: dir,
+      stdout: "piped",
+    });
   } else if (file.endsWith("zip")) {
     // It's a zip file
     if (isWindows) {
-      const args = [
-        "-Command",
-        `"& { Add-Type -A 'System.IO.Compression.FileSystem'; [IO.Compression.ZipFile]::ExtractToDirectory('${file}', '${dir}'); }"`,
-      ];
-      return safeWindowsExec(
-        "powershell",
-        args,
-        (cmd: string[]) => {
-          return execProcess(
-            {
-              cmd: cmd[0],
-              args: cmd.slice(1),
-              stdout: "piped",
-            },
-          );
-        },
-      );
+      // UTF-8 output keeps non-ASCII characters in error messages readable
+      const script = [
+        "[Console]::OutputEncoding = [Text.Encoding]::UTF8",
+        "Add-Type -A 'System.IO.Compression.FileSystem'",
+        `[IO.Compression.ZipFile]::ExtractToDirectory(${
+          powershellLiteral(file)
+        }, ${powershellLiteral(dir)})`,
+      ].join("; ");
+      return execProcess({
+        cmd: "powershell",
+        args: ["-NoProfile", "-NonInteractive", "-Command", script],
+        stdout: "piped",
+      });
     } else {
       // Use the built in unzip command
       return execProcess(
diff --git a/tests/docs/zip/unicode-entries.zip b/tests/docs/zip/unicode-entries.zip
new file mode 100644
index 0000000000..a68c6a4dd0
Binary files /dev/null and b/tests/docs/zip/unicode-entries.zip differ
diff --git a/tests/unit/zip.test.ts b/tests/unit/zip.test.ts
new file mode 100644
index 0000000000..22a794bac4
--- /dev/null
+++ b/tests/unit/zip.test.ts
@@ -0,0 +1,58 @@
+/*
+ * zip.test.ts
+ *
+ * Tests for zip extraction on Windows.
+ * Validates fix for:
+ *   https://github.com/quarto-dev/quarto-cli/issues/15198 (enterprise .bat blocking)
+ *
+ * Copyright (C) 2026 Posit Software, PBC
+ */
+
+import { unitTest } from "../test.ts";
+import { assert, assertEquals, assertStringIncludes } from "../asserts.ts";
+import { isWindows } from "../../src/deno_ral/platform.ts";
+import { join } from "../../src/deno_ral/path.ts";
+import { unzip } from "../../src/core/zip.ts";
+import { docs, withTempDir } from "../utils.ts";
+
+// Directory name with every character that has broken Windows extraction:
+// space and & (cmd), ' and ’ (PowerShell string), accent and CJK (code pages)
+const hostileDirName = "O'Brien & D’Arcy é 日本";
+
+unitTest(
+  "unzip - extracts non-ASCII entries into a path with quote, ampersand, accent and CJK on Windows (#15198)",
+  async () => {
+    await withTempDir(async (tempBase) => {
+      const dir = join(tempBase, hostileDirName);
+      Deno.mkdirSync(dir);
+      const archive = join(dir, "arch é.zip");
+      Deno.copyFileSync(docs("zip/unicode-entries.zip"), archive);
+
+      const result = await unzip(archive);
+
+      assert(result.success, `unzip failed: ${result.stderr}`);
+      assertEquals(
+        Deno.readTextFileSync(join(dir, "café 日本", "naïve 文件.txt")),
+        "contenu été",
+      );
+    });
+  },
+  { ignore: !isWindows },
+);
+
+unitTest(
+  "unzip - failure message keeps non-ASCII path characters on Windows (#15198)",
+  async () => {
+    await withTempDir(async (tempBase) => {
+      const dir = join(tempBase, hostileDirName);
+      Deno.mkdirSync(dir);
+      const archive = join(dir, "absent é 日本.zip");
+
+      const result = await unzip(archive);
+
+      assert(!result.success, "unzip of a missing archive should fail");
+      assertStringIncludes(result.stderr ?? "", "absent é 日本.zip");
+    });
+  },
+  { ignore: !isWindows },
+);