Can no longer open "extendtext.exe" after Windows update yesterday.

Question

I've never had this issue. I've been using RMXP for about a year now with no issues and then suddenly this morning, I can no longer run "extendtext.exe" without getting this error. I had a Windows update yesterday and I'm guessing that's the cause of the issue since I've found 1 other person who is in my exact situation. Neither of us has found a fix.

If I can't fix this, I literally can not continue developing my game as the text field by default is just too small. so I'm really hoping someone knows how to fix this.

cainy · Answer

Given the urgency, backup your project now to prevent data loss. If you locate specific logs or error messages, I can help interpret them further.

azraelen · Answer

If possible, try rolling back to the previous Windows update using the "Update History" in the Windows Settings app. This might help you identify if the issue is specific to a particular update.

andro700 · Answer

I have the same issue with one of my apps as well. Do you know what build it was that did this Here is a picture of mine app. This will give us a idea what update did this. Here is a list of updates in and around that date on from my system.

Windows 11 Insider Preview Quality Update (26220.7961)

Successfully installed on ‎3/‎6/‎2026

2026-03 Standalone Insider Preview Update (KB5082255)

Successfully installed on ‎3/‎4/‎2026

2026-01 .NET Framework Preview Update (KB5074828)

Successfully installed on ‎2/‎27/‎2026

Chuck

andro700 · Answer

I am having the same issue as you. I was wondering what build it was that cause this error. Here is a list of updates in and around that time for me. Also here is my error that I am getting on my app.