# ChxSmartScreen.exe

Windows Process: Microsoft Corporation

Also called chxsmartscreen, smartscreen app, apprep

Windows, System 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?

No

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

| 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

Technical details

| Image name | ChxSmartScreen.exe |
| ---------- | ------------------ |
| Package    | AppRep ChxApp      |

## Related

These entities connect to this article. Type is shown on every link.

[smartscreen.exe: Windows Process](https://feex.it/wiki/process/smartscreen.exe)[MsMpEng.exe: Windows Process](https://feex.it/wiki/process/msmpeng.exe)

## Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. [How we research](https://feex.it/wiki/research).

- [Microsoft Learn: SmartScreen ](https://learn.microsoft.com/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen)· Reputation vs UI
- [Microsoft Support: Windows ](https://support.microsoft.com/windows)· Public support naming
- [Foxhole process map ](https://foxhole.feex.it/)· First-party samples on Windows PCs. Not a lab benchmark.

## Was this article useful?

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Quick facts

The short identity of this page. Specs, sources, and the full story stay in the article.

- **Type**: Windows Process

  **Publisher**: Microsoft Corporation

  **Executable**: ChxSmartScreen.exe

  **Typical path**: C:\Windows\SystemApps\Microsoft.Windows.AppRep.ChxApp\_\*\ChxSmartScreen.exe

  **Mapped by Feex**: Seen on Windows PCs in Foxhole

Feex Reviewed: Last verified August 2026

---

Source: [Canonical Feex Wiki page](https://feex.it/wiki/process/chxsmartscreen.exe/)

[Developer guide](https://feex.it/wiki/developers/) | [API policy](https://feex.it/developers/api-policy/) | [Agent guidance](https://feex.it/wiki/llms.txt)