ChxSmartScreen.exe

Windows ProcessMicrosoft Corporation

Also called chxsmartscreen, smartscreen app, apprep

WindowsSystem Component

SmartScreen App Reputation UX host. It is the Windows 10/11 packaged prompt surface that SmartScreen can show, not the smartscreen.exe reputation engine.

What you need to know

This draws some SmartScreen warnings. smartscreen.exe still does the reputation check.

ChxSmartScreen.exe is the AppRep packaged UI. You see it when SmartScreen needs a modern prompt. Ending it dismisses that window. It does not disable reputation lookups.

Safe?: Yes, as a Windows package
Same as smartscreen.exe?: No. This one is the prompt UI
Should I end it?: The warning window closes

Feex says

If ChxSmartScreen is the name and a blue warning is on screen, I would read the file path on that page. The engine is still smartscreen.exe.

What is ChxSmartScreen.exe?

ChxSmartScreen.exe is the SmartScreen App Reputation experience host in SystemApps. It is an AppX package, not System32\smartscreen.exe.

What does it do?

It renders a warning or more-info page. The lookup still goes through SmartScreen. MsMpEng.exe may also scan the same file.

Why is it running?

You launched a Mark-of-the-Web file or an unrecognized app. The process should exit after you choose Run or Don't run.

Is it safe?

Usually safe

The Microsoft SystemApps package is the prompt. A ChxSmartScreen.exe in Downloads is not AppRep.

A legitimate copy normally runs from:

C:\Windows\SystemApps\Microsoft.Windows.AppRep.ChxApp_*\ChxSmartScreen.exe

Packaged UI
Engine: smartscreen.exe
Not Defender file scan

Can I end it?

Closes the warning

Ending ChxSmartScreen.exe is like closing the dialog. SmartScreen policy stays. Use Windows Security to change reputation settings.

Can I remove it?

Do not delete the AppRep package. You would lose the supported SmartScreen warning UI. Reputation policy lives in Windows Security, not in Explorer.

Should it start with Windows?

SmartScreen starts it on demand. It is not a tray app.

Normal resource behavior

These are contextual labels, not universal averages.

CPU: Low while the page is open
Memory: Moderate for a packaged host
Network: The engine may look up reputation
Disk: Low

File information

ChxSmartScreen.exe file information
Executable name	ChxSmartScreen.exe
Common legitimate path	C:\Windows\SystemApps\Microsoft.Windows.AppRep.ChxApp_*\ChxSmartScreen.exe
Publisher	Microsoft Corporation
Signature expectation	Signed by Microsoft Windows

Common problems

Warning on a tool you trust

Unblock the file or sign it. Do not delete ChxSmartScreen to skip the check forever.

Two SmartScreen names

smartscreen.exe is the checker. This exe is a prompt host.

Troubleshooting

Diagnose before you change anything destructive.

Read the blocked path on the UI

That file is the question, not this host.

App and browser control in Windows Security

The policy lives there.

Technical details

ChxSmartScreen.exe technical details
Image name	ChxSmartScreen.exe
Package	AppRep ChxApp

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. How we research.

Microsoft Learn: SmartScreen · Reputation vs UI
Microsoft Support: Windows · Public support naming
Foxhole process map · First-party samples on Windows PCs. Not a lab benchmark.

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