Microsoft PowerToys version

0.98.1

Installation method

PowerToys auto-update, Microsoft Store

Area(s) with issue?

Environment Variables

Steps to reproduce

Environment Variables allows to add a variable with: (placeholder values)
Name : "test="
Value:"123"

the "=" sign at the end is a invalid character for an environment variable.
on the Next start/restart windows crashed with stopcode: 0xc000021a., i had to open cmd in troubleshoot options and remove the env variable.

Detailed reason when this happened (Un intuitive design) :
0. Environment variables already contain "test=123" Key-Value pair. (i was not aware of this beforehand)

1. I paste "test=123" into the Name field of add variable of system variables.
2. I remove "=123" from the value text input box.
3. The save button greys out without an error saying that key already exists.
4. I add an "=" sign at the end of the Name for it to become "test=". and "123" as the Value. and click save.
5. restart pc -> crashes and boot loops.

✔️ Expected Behavior

Shouldnt allow saving invalid key value pairs and add an error or warning when Name matches a key value already in the environment variables list.

❌ Actual Behavior

1. Environment Variables allows to add a variable with an "=" sign at the end of the Name text input box like following:
   (placeholder values)
   Name : "test="
   Value:"123"

2. doesn't show an error or warning when just "test" is present in the name field and the save button is greyed out when there is already a Key whose name is "test".

Upload Bug Report ZIP-file

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Additional Information

Windows 11 Pro-25H2-26200.8117

Other Software

N/A