diff --git a/scripts/hooks/ambient-prompt.sh b/scripts/hooks/ambient-prompt.sh
index f8791d1..d3fc33e 100755
--- a/scripts/hooks/ambient-prompt.sh
+++ b/scripts/hooks/ambient-prompt.sh
@@ -5,7 +5,7 @@
 # relevant skill loading via the ambient-router skill.
 # Zero file I/O beyond stdin — static injection only.
 
-set -euo pipefail
+set -e
 
 # jq is required to parse hook input JSON — silently no-op if missing
 if ! command -v jq &>/dev/null; then exit 0; fi
diff --git a/scripts/hooks/background-memory-update.sh b/scripts/hooks/background-memory-update.sh
index 15c9a36..0dd5877 100755
--- a/scripts/hooks/background-memory-update.sh
+++ b/scripts/hooks/background-memory-update.sh
@@ -5,7 +5,7 @@
 # Resumes the parent session headlessly to update .memory/WORKING-MEMORY.md.
 # On failure: logs error, does nothing (no fallback).
 
-set -euo pipefail
+set -e
 
 CWD="$1"
 SESSION_ID="$2"
diff --git a/scripts/hooks/pre-compact-memory.sh b/scripts/hooks/pre-compact-memory.sh
index 7653b85..3d10980 100644
--- a/scripts/hooks/pre-compact-memory.sh
+++ b/scripts/hooks/pre-compact-memory.sh
@@ -6,7 +6,7 @@
 # has something to inject after compaction.
 # PreCompact hooks cannot block compaction — this is informational only.
 
-set -euo pipefail
+set -e
 
 # jq is required to parse hook input JSON — silently no-op if missing
 if ! command -v jq &>/dev/null; then exit 0; fi
diff --git a/scripts/hooks/run-hook b/scripts/hooks/run-hook
new file mode 100755
index 0000000..054d5d4
--- /dev/null
+++ b/scripts/hooks/run-hook
@@ -0,0 +1,15 @@
+: << 'CMDBLOCK'
+@echo off
+setlocal enabledelayedexpansion
+set "SCRIPT_DIR=%~dp0"
+set "HOOK_NAME=%~1"
+shift
+where bash >nul 2>&1 && (
+    bash "%SCRIPT_DIR%%HOOK_NAME%.sh" %* & exit /b !errorlevel!
+)
+exit /b 0
+CMDBLOCK
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+HOOK_NAME="$1"
+shift
+exec bash "$SCRIPT_DIR/${HOOK_NAME}.sh" "$@"
diff --git a/scripts/hooks/session-start-memory.sh b/scripts/hooks/session-start-memory.sh
index 50529ad..6bc09c7 100644
--- a/scripts/hooks/session-start-memory.sh
+++ b/scripts/hooks/session-start-memory.sh
@@ -5,7 +5,7 @@
 # Also captures fresh git state so Claude knows what's changed since the memory was written.
 # Adds staleness warning if memory is >1 hour old.
 
-set -euo pipefail
+set -e
 
 # jq is required to parse hook input JSON — silently no-op if missing
 if ! command -v jq &>/dev/null; then exit 0; fi
diff --git a/scripts/hooks/stop-update-memory.sh b/scripts/hooks/stop-update-memory.sh
index d54298d..411a2be 100755
--- a/scripts/hooks/stop-update-memory.sh
+++ b/scripts/hooks/stop-update-memory.sh
@@ -5,7 +5,7 @@
 # The session ends immediately — no visible edit in the TUI.
 # On failure: does nothing (stale memory is better than fake data).
 
-set -euo pipefail
+set -e
 
 # Break feedback loop: background updater's headless session triggers stop hook on exit.
 # DEVFLOW_BG_UPDATER is set by background-memory-update.sh before invoking claude.
diff --git a/src/cli/commands/ambient.ts b/src/cli/commands/ambient.ts
index 492ae27..b6153d4 100644
--- a/src/cli/commands/ambient.ts
+++ b/src/cli/commands/ambient.ts
@@ -23,7 +23,7 @@ interface Settings {
   [key: string]: unknown;
 }
 
-const AMBIENT_HOOK_MARKER = 'ambient-prompt.sh';
+const AMBIENT_HOOK_MARKER = 'ambient-prompt';
 
 /**
  * Add the ambient UserPromptSubmit hook to settings JSON.
@@ -40,7 +40,7 @@ export function addAmbientHook(settingsJson: string, devflowDir: string): string
     settings.hooks = {};
   }
 
-  const hookCommand = path.join(devflowDir, 'scripts', 'hooks', AMBIENT_HOOK_MARKER);
+  const hookCommand = path.join(devflowDir, 'scripts', 'hooks', 'run-hook') + ' ambient-prompt';
 
   const newEntry: HookMatcher = {
     hooks: [
diff --git a/src/cli/commands/memory.ts b/src/cli/commands/memory.ts
index b4c186d..d6e2e41 100644
--- a/src/cli/commands/memory.ts
+++ b/src/cli/commands/memory.ts
@@ -28,9 +28,9 @@ interface Settings {
  * Map of hook event type → filename marker for the 3 memory hooks.
  */
 const MEMORY_HOOK_CONFIG: Record<string, string> = {
-  Stop: 'stop-update-memory.sh',
-  SessionStart: 'session-start-memory.sh',
-  PreCompact: 'pre-compact-memory.sh',
+  Stop: 'stop-update-memory',
+  SessionStart: 'session-start-memory',
+  PreCompact: 'pre-compact-memory',
 };
 
 /**
@@ -57,7 +57,7 @@ export function addMemoryHooks(settingsJson: string, devflowDir: string): string
     );
 
     if (!alreadyPresent) {
-      const hookCommand = path.join(devflowDir, 'scripts', 'hooks', marker);
+      const hookCommand = path.join(devflowDir, 'scripts', 'hooks', 'run-hook') + ` ${marker}`;
       const newEntry: HookMatcher = {
         hooks: [
           {
diff --git a/src/cli/utils/installer.ts b/src/cli/utils/installer.ts
index f267330..ed10d42 100644
--- a/src/cli/utils/installer.ts
+++ b/src/cli/utils/installer.ts
@@ -224,7 +224,9 @@ export async function installViaFileCopy(options: FileCopyOptions): Promise<void
   try {
     await fs.mkdir(scriptsTarget, { recursive: true });
     await copyDirectory(scriptsSource, scriptsTarget);
-    await chmodRecursive(scriptsTarget, 0o755);
+    if (process.platform !== 'win32') {
+      await chmodRecursive(scriptsTarget, 0o755);
+    }
   } catch { /* scripts may not exist */ }
 
   spinner.stop('Components installed via file copy');
diff --git a/tests/ambient.test.ts b/tests/ambient.test.ts
index 7550000..96e4aa0 100644
--- a/tests/ambient.test.ts
+++ b/tests/ambient.test.ts
@@ -7,7 +7,7 @@ describe('addAmbientHook', () => {
     const settings = JSON.parse(result);
 
     expect(settings.hooks.UserPromptSubmit).toHaveLength(1);
-    expect(settings.hooks.UserPromptSubmit[0].hooks[0].command).toContain('ambient-prompt.sh');
+    expect(settings.hooks.UserPromptSubmit[0].hooks[0].command).toContain('ambient-prompt');
     expect(settings.hooks.UserPromptSubmit[0].hooks[0].timeout).toBe(5);
   });
 
@@ -35,7 +35,7 @@ describe('addAmbientHook', () => {
 
     expect(settings.hooks.UserPromptSubmit).toHaveLength(2);
     expect(settings.hooks.UserPromptSubmit[0].hooks[0].command).toBe('other-hook.sh');
-    expect(settings.hooks.UserPromptSubmit[1].hooks[0].command).toContain('ambient-prompt.sh');
+    expect(settings.hooks.UserPromptSubmit[1].hooks[0].command).toContain('ambient-prompt');
   });
 
   it('is idempotent — does not add duplicate hooks', () => {
@@ -58,12 +58,13 @@ describe('addAmbientHook', () => {
     expect(settings.hooks.UserPromptSubmit).toHaveLength(1);
   });
 
-  it('uses correct devflowDir path in command', () => {
+  it('uses correct devflowDir path in command via run-hook wrapper', () => {
     const result = addAmbientHook('{}', '/custom/path/.devflow');
     const settings = JSON.parse(result);
     const command = settings.hooks.UserPromptSubmit[0].hooks[0].command;
 
-    expect(command).toContain('/custom/path/.devflow/scripts/hooks/ambient-prompt.sh');
+    expect(command).toContain('/custom/path/.devflow/scripts/hooks/run-hook');
+    expect(command).toContain('ambient-prompt');
   });
 });
 
@@ -81,7 +82,7 @@ describe('removeAmbientHook', () => {
       hooks: {
         UserPromptSubmit: [
           { hooks: [{ type: 'command', command: 'other-hook.sh' }] },
-          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt.sh' }] },
+          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt' }] },
         ],
       },
     });
@@ -96,7 +97,7 @@ describe('removeAmbientHook', () => {
     const input = JSON.stringify({
       hooks: {
         UserPromptSubmit: [
-          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt.sh' }] },
+          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt' }] },
         ],
       },
     });
@@ -111,7 +112,7 @@ describe('removeAmbientHook', () => {
       hooks: {
         Stop: [{ hooks: [{ type: 'command', command: 'stop.sh' }] }],
         UserPromptSubmit: [
-          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt.sh' }] },
+          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt' }] },
         ],
       },
     });
@@ -134,7 +135,7 @@ describe('removeAmbientHook', () => {
       statusLine: { type: 'command' },
       hooks: {
         UserPromptSubmit: [
-          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt.sh' }] },
+          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt' }] },
         ],
       },
     });
@@ -171,7 +172,7 @@ describe('hasAmbientHook', () => {
       hooks: {
         UserPromptSubmit: [
           { hooks: [{ type: 'command', command: 'other-hook.sh' }] },
-          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt.sh' }] },
+          { hooks: [{ type: 'command', command: '/path/to/ambient-prompt' }] },
         ],
       },
     });
diff --git a/tests/memory.test.ts b/tests/memory.test.ts
index d537eaa..76a8bea 100644
--- a/tests/memory.test.ts
+++ b/tests/memory.test.ts
@@ -13,9 +13,9 @@ describe('addMemoryHooks', () => {
     expect(settings.hooks.Stop).toHaveLength(1);
     expect(settings.hooks.SessionStart).toHaveLength(1);
     expect(settings.hooks.PreCompact).toHaveLength(1);
-    expect(settings.hooks.Stop[0].hooks[0].command).toContain('stop-update-memory.sh');
-    expect(settings.hooks.SessionStart[0].hooks[0].command).toContain('session-start-memory.sh');
-    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('pre-compact-memory.sh');
+    expect(settings.hooks.Stop[0].hooks[0].command).toContain('stop-update-memory');
+    expect(settings.hooks.SessionStart[0].hooks[0].command).toContain('session-start-memory');
+    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('pre-compact-memory');
   });
 
   it('preserves existing hooks (UserPromptSubmit/ambient untouched)', () => {
@@ -44,8 +44,8 @@ describe('addMemoryHooks', () => {
   it('adds only missing hooks when partial state (1 hook missing)', () => {
     const input = JSON.stringify({
       hooks: {
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh', timeout: 10 }] }],
-        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory.sh', timeout: 10 }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory', timeout: 10 }] }],
+        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory', timeout: 10 }] }],
       },
     });
     const result = addMemoryHooks(input, '/home/user/.devflow');
@@ -56,7 +56,7 @@ describe('addMemoryHooks', () => {
     expect(settings.hooks.SessionStart).toHaveLength(1);
     // Missing hook added
     expect(settings.hooks.PreCompact).toHaveLength(1);
-    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('pre-compact-memory.sh');
+    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('pre-compact-memory');
   });
 
   it('creates hooks object if missing', () => {
@@ -68,13 +68,16 @@ describe('addMemoryHooks', () => {
     expect(settings.hooks.Stop).toHaveLength(1);
   });
 
-  it('uses correct devflowDir path in command', () => {
+  it('uses correct devflowDir path in command via run-hook wrapper', () => {
     const result = addMemoryHooks('{}', '/custom/path/.devflow');
     const settings = JSON.parse(result);
 
-    expect(settings.hooks.Stop[0].hooks[0].command).toContain('/custom/path/.devflow/scripts/hooks/stop-update-memory.sh');
-    expect(settings.hooks.SessionStart[0].hooks[0].command).toContain('/custom/path/.devflow/scripts/hooks/session-start-memory.sh');
-    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('/custom/path/.devflow/scripts/hooks/pre-compact-memory.sh');
+    expect(settings.hooks.Stop[0].hooks[0].command).toContain('/custom/path/.devflow/scripts/hooks/run-hook');
+    expect(settings.hooks.Stop[0].hooks[0].command).toContain('stop-update-memory');
+    expect(settings.hooks.SessionStart[0].hooks[0].command).toContain('run-hook');
+    expect(settings.hooks.SessionStart[0].hooks[0].command).toContain('session-start-memory');
+    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('run-hook');
+    expect(settings.hooks.PreCompact[0].hooks[0].command).toContain('pre-compact-memory');
   });
 
   it('preserves other settings (statusLine, env)', () => {
@@ -113,9 +116,9 @@ describe('removeMemoryHooks', () => {
     const input = JSON.stringify({
       hooks: {
         UserPromptSubmit: [{ hooks: [{ type: 'command', command: 'ambient-prompt.sh' }] }],
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh' }] }],
-        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory.sh' }] }],
-        PreCompact: [{ hooks: [{ type: 'command', command: '/path/pre-compact-memory.sh' }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory' }] }],
+        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory' }] }],
+        PreCompact: [{ hooks: [{ type: 'command', command: '/path/pre-compact-memory' }] }],
       },
     });
     const result = removeMemoryHooks(input);
@@ -139,7 +142,7 @@ describe('removeMemoryHooks', () => {
   it('cleans empty hook type arrays', () => {
     const input = JSON.stringify({
       hooks: {
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh' }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory' }] }],
       },
     });
     const result = removeMemoryHooks(input);
@@ -159,7 +162,7 @@ describe('removeMemoryHooks', () => {
   it('removes only the hooks that exist (partial)', () => {
     const input = JSON.stringify({
       hooks: {
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh' }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory' }] }],
         // SessionStart and PreCompact already missing
       },
     });
@@ -173,9 +176,9 @@ describe('removeMemoryHooks', () => {
     const input = JSON.stringify({
       statusLine: { type: 'command' },
       hooks: {
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh' }] }],
-        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory.sh' }] }],
-        PreCompact: [{ hooks: [{ type: 'command', command: '/path/pre-compact-memory.sh' }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory' }] }],
+        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory' }] }],
+        PreCompact: [{ hooks: [{ type: 'command', command: '/path/pre-compact-memory' }] }],
       },
     });
     const result = removeMemoryHooks(input);
@@ -198,7 +201,7 @@ describe('hasMemoryHooks', () => {
   it('returns false when partial (1 or 2 of 3)', () => {
     const input = JSON.stringify({
       hooks: {
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh' }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory' }] }],
       },
     });
     expect(hasMemoryHooks(input)).toBe(false);
@@ -227,8 +230,8 @@ describe('countMemoryHooks', () => {
   it('returns correct partial count', () => {
     const input = JSON.stringify({
       hooks: {
-        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory.sh' }] }],
-        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory.sh' }] }],
+        Stop: [{ hooks: [{ type: 'command', command: '/path/stop-update-memory' }] }],
+        SessionStart: [{ hooks: [{ type: 'command', command: '/path/session-start-memory' }] }],
       },
     });
     expect(countMemoryHooks(input)).toBe(2);