diff --git a/codex-rs/windows-sandbox-rs/src/acl.rs b/codex-rs/windows-sandbox-rs/src/acl.rs
index 68a17c9799..155ecf07bb 100644
--- a/codex-rs/windows-sandbox-rs/src/acl.rs
+++ b/codex-rs/windows-sandbox-rs/src/acl.rs
@@ -173,47 +173,6 @@ pub fn path_mask_allows(
     }
 }
 
-pub unsafe fn dacl_has_write_allow_for_sid(p_dacl: *mut ACL, psid: *mut c_void) -> bool {
-    if p_dacl.is_null() {
-        return false;
-    }
-    let mut info: ACL_SIZE_INFORMATION = std::mem::zeroed();
-    let ok = GetAclInformation(
-        p_dacl as *const ACL,
-        &mut info as *mut _ as *mut c_void,
-        std::mem::size_of::<ACL_SIZE_INFORMATION>() as u32,
-        AclSizeInformation,
-    );
-    if ok == 0 {
-        return false;
-    }
-    let count = info.AceCount as usize;
-    for i in 0..count {
-        let mut p_ace: *mut c_void = std::ptr::null_mut();
-        if GetAce(p_dacl as *const ACL, i as u32, &mut p_ace) == 0 {
-            continue;
-        }
-        let hdr = &*(p_ace as *const ACE_HEADER);
-        if hdr.AceType != 0 {
-            continue; // ACCESS_ALLOWED_ACE_TYPE
-        }
-        // Ignore ACEs that are inherit-only (do not apply to the current object)
-        if (hdr.AceFlags & INHERIT_ONLY_ACE) != 0 {
-            continue;
-        }
-        let ace = &*(p_ace as *const ACCESS_ALLOWED_ACE);
-        let mask = ace.Mask;
-        let base = p_ace as usize;
-        let sid_ptr =
-            (base + std::mem::size_of::<ACE_HEADER>() + std::mem::size_of::<u32>()) as *mut c_void;
-        let eq = EqualSid(sid_ptr, psid);
-        if eq != 0 && (mask & FILE_GENERIC_WRITE) != 0 {
-            return true;
-        }
-    }
-    false
-}
-
 pub unsafe fn dacl_has_write_deny_for_sid(p_dacl: *mut ACL, psid: *mut c_void) -> bool {
     if p_dacl.is_null() {
         return false;
@@ -374,70 +333,12 @@ pub unsafe fn ensure_allow_write_aces(path: &Path, sids: &[*mut c_void]) -> Resu
     ensure_allow_mask_aces(path, sids, WRITE_ALLOW_MASK)
 }
 
-/// Adds an allow ACE granting read/write/execute to the given SID on the target path.
+/// Adds an allow ACE granting the full sandbox write mask to the given SID on the target path.
 ///
 /// # Safety
 /// Caller must ensure `psid` points to a valid SID and `path` refers to an existing file or directory.
 pub unsafe fn add_allow_ace(path: &Path, psid: *mut c_void) -> Result<bool> {
-    let mut p_sd: *mut c_void = std::ptr::null_mut();
-    let mut p_dacl: *mut ACL = std::ptr::null_mut();
-    let code = GetNamedSecurityInfoW(
-        to_wide(path).as_ptr(),
-        1,
-        DACL_SECURITY_INFORMATION,
-        std::ptr::null_mut(),
-        std::ptr::null_mut(),
-        &mut p_dacl,
-        std::ptr::null_mut(),
-        &mut p_sd,
-    );
-    if code != ERROR_SUCCESS {
-        return Err(anyhow!("GetNamedSecurityInfoW failed: {code}"));
-    }
-    // Already has write? Skip costly DACL rewrite.
-    if dacl_has_write_allow_for_sid(p_dacl, psid) {
-        if !p_sd.is_null() {
-            LocalFree(p_sd as HLOCAL);
-        }
-        return Ok(false);
-    }
-    let mut added = false;
-    // Always ensure write is present: if an allow ACE exists without write, add one with write+RX.
-    let trustee = TRUSTEE_W {
-        pMultipleTrustee: std::ptr::null_mut(),
-        MultipleTrusteeOperation: 0,
-        TrusteeForm: TRUSTEE_IS_SID,
-        TrusteeType: TRUSTEE_IS_UNKNOWN,
-        ptstrName: psid as *mut u16,
-    };
-    let mut explicit: EXPLICIT_ACCESS_W = std::mem::zeroed();
-    explicit.grfAccessPermissions = FILE_GENERIC_READ | FILE_GENERIC_WRITE | FILE_GENERIC_EXECUTE;
-    explicit.grfAccessMode = 2; // SET_ACCESS
-    explicit.grfInheritance = CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE;
-    explicit.Trustee = trustee;
-    let mut p_new_dacl: *mut ACL = std::ptr::null_mut();
-    let code2 = SetEntriesInAclW(1, &explicit, p_dacl, &mut p_new_dacl);
-    if code2 == ERROR_SUCCESS {
-        let code3 = SetNamedSecurityInfoW(
-            to_wide(path).as_ptr() as *mut u16,
-            1,
-            DACL_SECURITY_INFORMATION,
-            std::ptr::null_mut(),
-            std::ptr::null_mut(),
-            p_new_dacl,
-            std::ptr::null_mut(),
-        );
-        if code3 == ERROR_SUCCESS {
-            added = !dacl_has_write_allow_for_sid(p_dacl, psid);
-        }
-        if !p_new_dacl.is_null() {
-            LocalFree(p_new_dacl as HLOCAL);
-        }
-    }
-    if !p_sd.is_null() {
-        LocalFree(p_sd as HLOCAL);
-    }
-    Ok(added)
+    ensure_allow_write_aces(path, &[psid])
 }
 
 /// Adds a deny ACE to prevent write/append/delete for the given SID on the target path.