How to Fish Error 0x11C7: Smart App Control Blocks the Game
You click Play, the process flashes, and Windows reports error 0x11C7. This is a security-policy block, not a game bug — and the fix order matters if you do not want to lower your whole system's defenses.
Sources & Verification
- Smart App Control frequently asked questions — Microsoft Support — Official Microsoft documentation on Smart App Control behavior
- App & browser control in the Windows Security app — Microsoft Support — Where to find the Smart App Control toggle
Data on this page is re-verified against the sources above after each official patch. See our editorial policy for how we source and correct game data.
What Error 0x11C7 Actually Means
The 0x11C7 failure appears when Windows application control stops How to Fish.exe before the first frame. Smart App Control — the reputation-based gate that ships enabled on fresh Windows 11 installs — evaluates every downloaded executable, and indie games repackaged by frequent patches sometimes lack the reputation history to pass automatically. Enterprise machines can hit the same code through Group Policy application-control rules instead.
The diagnostic tell is timing: a genuine game crash shows a splash screen or a crash reporter. 0x11C7 is instant, because the OS vetoed the launch. Your save data is untouched — nothing ran far enough to touch it.
Safe Fix Order
- Verify game files in Steam (Properties → Local Files → Verify Integrity of Game Files). A truncated download is the cheapest possible cause and takes two minutes to rule out.
- Reboot Windows. Application-control verdicts are cached per file per session; verified executables frequently launch normally after a restart.
- Check Protection History in Windows Security. It names the exact blocked file. If the path is not the game executable, you are chasing the wrong enemy — whitelist that file in the tool that flagged it.
- Reinstall into a non-system-drive library if verification keeps failing on the same file.
- Only then, consider Smart App Control. Turn it off via Settings → Privacy & Security → Windows Security → App & browser control → Smart App Control → Off. Remember: it cannot be switched back on without resetting Windows, so everything on this list above is worth exhausting first.
FAQ
What does How to Fish error 0x11C7 mean?
0x11C7 is not a How to Fish crash code — it is a Windows application-control block. The game process is stopped before it ever starts because Windows Smart App Control (or an enterprise app-control policy) does not trust the executable. That is why double-clicking produces an instant error instead of a splash screen.
Why did Smart App Control start blocking a game that used to run?
Smart App Control is cloud-based and re-evaluates files as reputation data changes. A game update, a fresh download, or a modified executable hash can flip a previously-trusted file to untrusted. If How to Fish patched recently (1.0.4 through 1.0.9 all shipped quickly after launch), the new exe may simply not have enough good reputation signals yet.
Is error 0x11C7 related to Patch 1.0.9?
No patch note has ever referenced 0x11C7. The timing correlation players report usually comes from the exe being replaced by the update, which triggers a fresh Smart App Control evaluation. Treat every "game stopped launching after update" report as a trust problem to diagnose, not a bug in a specific patch.
What should I try first?
In Steam, right-click How to Fish, open Properties, go to Local Files, and run Verify Integrity of Game Files. This replaces any corrupted or partially-downloaded executable — the most common benign cause. Then reboot: Smart App Control decisions are cached, and a restart clears the block state for files that verified clean.
Should I disable Smart App Control?
Only if you accept the trade-off, and do it knowing it cannot be re-enabled without resetting Windows. The setting lives under Settings, Privacy & Security, Windows Security, App & browser control, Smart App Control. Setting it to Off removes the block but weakens protection for every app, not just this game. If you prefer to keep it on, add a Steam-library exclusion in Windows Security and verify the game files instead.
The game still will not launch. What next?
Check Windows Security Protection history for the exact blocked file path — if it is not the game exe, the real culprit is an antivirus or overlay injecting into the process. Run a clean boot, reinstall to a non-system-drive Steam library, and confirm no Group Policy application-control rules apply (common on managed PCs). If a security tool names the file explicitly, whitelist it there before touching Smart App Control again.
Related Fixes
For generic launch failures without an error code, see black screen & best settings. If co-op lobbies are the problem instead, the cannot join friends guide covers version mismatches and lobby black screens.