Windows 11 Startup compatibility in Windows 11

Hi Beppino46 — yes, this is a common Windows 11 quirk. The compatibility layer and/or elevation prompts can prevent legacy Win32 programs from launching reliably during the normal Startup sequence. The simplest, reliable workaround is to run the app from a Scheduled Task (trigger: At logon) — that lets you (a) delay the launch until the desktop is ready and (b) run elevated without a UAC prompt if configured correctly.
Below are a few options (GUI + command-line) and why they work.
Quick checklist (do these first)

• Make sure the compatibility setting is applied to the actual .exe (right‑click the EXE → Properties → Compatibility → set “Run this program in compatibility mode for: Windows 8”). Applying it only to a shortcut can fail.
• If “Run this program as an administrator” is checked, that will trigger a UAC prompt at startup and block automatic start. Remove that check and use a Scheduled Task with elevated privileges instead (below).

Recommended: Create a Scheduled Task that runs at logon
GUI steps (recommended)

• Start → type Task Scheduler → open it.
• Right‑click Task Scheduler Library → Create Task (not “Create Basic Task”).
• General tab:
• Name: Start My Legacy App
• Choose “Run only when user is logged on” if the app shows UI. If it must run elevated, check “Run with highest privileges.”
• Configure for: Windows 10 / Windows 11 (choose the latest option available).
• Triggers tab:
• New → Begin the task: “At log on”
• Select the specific user or “Any user” as needed.
• (Important) Check “Delay task for:” and choose 30 seconds–1 minute. This lets Windows finish startup and apply compatibility shims before the app runs.
• OK.
• Actions tab:
• New → Action: Start a program
• Program/script: full path to your app EXE (e.g., C:\Program Files\OldApp\old.exe)
• Start in (optional): folder containing the EXE
• OK.
• Conditions / Settings: adjust as needed (uncheck “Stop the task if it runs longer than…” if the app runs long).
• OK to save. Test by right‑click → Run. Then sign out/back in to confirm it starts automatically.

Why this works

• Scheduled Task runs after logon and can be delayed so compatibility shims and user shell are fully available.
• “Run with highest privileges” in a task that runs for the logged-on user can start elevated without showing a UAC prompt at login (avoids blocking).

Alternative: Delayed Startup shortcut (if you prefer Startup folder)

• Create a small script that waits then launches the app:
• PowerShell example:
• Start-Sleep -Seconds 30
• Start-Process "C:\Path\to\app.exe"
• Save as StartLegacyApp.ps1 or wrap in a .cmd and put a shortcut to it into shell:startup (Win+R → shell:startup).
• Note: if the app requires elevation, the Startup folder will cause a UAC prompt and fail to auto-start — Task Scheduler is preferred in that case.

Troubleshooting tips

• If the app depends on network or services, choose a trigger like “At log on” plus a longer delay, or add a trigger “On connection to user session” / “On workstation unlock”.
• Check Task History in Task Scheduler (enable history) to see failures.
• If you used “Run whether user is logged on or not”, Windows will prompt for credentials when creating the task — storing credentials has security implications; prefer “Run only when user is logged on” for apps that display UI.
• If nothing runs at all at startup, try disabling Fast Startup in Control Panel → Power Options → Choose what the power buttons do → Change settings that are currently unavailable → uncheck “Turn on fast startup”.

If you want, tell me:

• the full path to the EXE(s),
• whether they require admin rights or show UI,
  and I’ll provide the exact Task Scheduler settings or a ready-made schtasks / PowerShell command you can paste to create the task.