Cannot use "\" as Extension Alias for Extensions Installed from Microsoft Store

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### Microsoft PowerToys version

0.97.2

### Installation method

PowerToys auto-update

### Area(s) with issue?

Command Palette

### Steps to reproduce

Just set the alias to be "\" for an extension, e.g. "Everything for CmdPal", will case the app to crash

### ✔️ Expected Behavior

_No response_

### ❌ Actual Behavior

_No response_

### Upload Bug Report ZIP-file

[PowerToysReport_2026-03-16-11-42-38.zip](https://github.com/user-attachments/files/26029523/PowerToysReport_2026-03-16-11-42-38.zip)

### Additional Information

OS Build 26200.8037

.Net Version:
Microsoft.AspNetCore.App 8.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

### Other Software

_No response_

Start in the Command Palette extension-alias flow and reproduce the crash by assigning "\" to an installed extension such as Everything for CmdPal. Use the attached PowerToys report ZIP to identify the failing path; no source file or test is named. Done means this alias no longer crashes the app.

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