Status · Blocked by Windows
Your game won’t launch — and it’s Windows, not the game
A Steam game that shows error 0x11c7 or flashes “Smart App Control blocked an app that may be unsafe”is being stopped by Windows 11’s Smart App Control, not because the game is broken — the block just means Windows couldn’t confirm the file as trusted, which isn’t proof of a virus either way. A game that instead closes the instant you press Play with no message can be this too, and it is worth checking before you blame the game. Here is how to get past it.
Verify the game files in Steam first — that rules out a bad download without changing anything. If it is a genuine Smart App Control block, open Windows Security → App & browser control → Smart App Control settings and set it to Off, then relaunch. Smart App Control has no per-app exception, so that toggle is the way past it — everything below is the same path, step by step.
Where the toggle lives
- Windows Security
- App & browser control
- Smart App Control settings
- Off
Full sequence
step 01
Confirm it is Smart App Control
Open Windows Security, go to App & browser control, and find the Smart App Control panel. If it says On and you are getting 0x11c7, that is very likely the cause; if a game just closes with no message, Smart App Control is one thing worth ruling out. Either way, a genuine block shows a Windows notification naming the app — that is the clearest confirmation. No panel at all means your PC doesn’t have the feature — skip to step 4.step 02
Rule out a broken install first
Before you change any security setting, verify the game files in Steam (right-click → Properties → Installed Files → Verify) and make sure the game is fully updated. This is reversible and risk-free, and it clears the most common cause that isn’t Windows: a corrupted download.step 03
Turn Smart App Control off — the direct fix
In Smart App Control settings choose Off and relaunch from Steam. There is no per-app allow-list for Smart App Control, so this is the actual fix for a genuine block. Know first: turning it off can be hard to undo — depending on your Windows version, getting it back may need a Windows reset, so update Windows first if you want that option, and only switch it off for software you trust.step 04
No panel, or a work or school PC
If there is no Smart App Control panel, your PC doesn’t have the feature and 0x11c7 has another cause — usually a corrupted install (step 2) or a managed-device policy. On a work or school machine an administrator may have locked the setting, and getting past it needs their help rather than a toggle.
How the block actually happens
Why unsigned games trip it
Smart App Control only runs software it can verify as safe — it checks a cloud trust signal, and a valid company signature on the executable is one of the things it looks for. An unsigned build that its cloud check doesn’t already recognise — common when a small studio skips the paid code-signing certificate — is the kind of thing it stops, so the game gets halted the instant you press Play, with nothing but a code like 0x11c7 to explain it. It is a property of Windows, not of any one game, which is why the same block turns up across unrelated titles.
Games people search “won’t launch” for
Whether it is this Windows block or something else depends on the game. Here is what each one actually turns out to be — including one that isn’t Smart App Control at all.
Palworld
Smart App Control
“An application control policy has blocked this file” — the unsigned-executable block.
Water You Doing?
Smart App Control
Error 0x11c7 — the developer confirmed this one directly.
How to Fish
Not this block
A black screen on startup, not this Windows block — how to tell, and that fix.
And it is not only games
Smart App Control stops any program it can’t verify, so unsigned open-source tools run into the same wall. These are examples people have reported the block on:
- qBittorrent
- Cheat Engine
- FileZilla
- + other unsigned tools
Common questions
01What is error 0x11c7 on Steam?+
0x11c7 means a Windows security policy blocked the game's file from running. On a normal Windows 11 home PC that policy is almost always Smart App Control, which stops programs it can't verify as safe — unsigned indie builds included. It is a Windows block, not a Steam fault, and the code by itself does not mean the file is infected.
02My game closes immediately after launch with no error. Same thing?+
It can be. Smart App Control can block a game so fast that it looks like it opened and closed instantly, with no message at all. If a game vanishes the moment you press Play on Windows 11, check Smart App Control before assuming the game is broken.
03How do I fix Smart App Control blocking a game?+
First verify the game files in Steam to rule out a corrupted install. If it is a genuine Smart App Control block, turn Smart App Control off in Windows Security → App & browser control → Smart App Control settings, then relaunch. Smart App Control has no per-app exception, so the ways past it are to turn it off, or to wait for Windows to trust the app — which happens when the developer ships a signed build or the app builds up enough cloud reputation.
04Is it safe to turn off Smart App Control?+
It removes one automated check that blocks software Windows cannot verify, so only turn it off for software you trust from a source you trust, like a game you bought on Steam. Know first that turning it off can be hard to reverse: depending on your Windows version, re-enabling it may require resetting Windows, so update Windows first if you want to keep that option.
05Why did this start happening only recently?+
Smart App Control is a newer Windows 11 feature — off on older installs, on by default on many newer ones. If it is switched on for you but not for a friend, the same unsigned game can be blocked on your PC and run fine on theirs, showing 0x11c7 or 'Smart App Control blocked an app that may be unsafe'.