I tried the .NET repair - no luck with that. Then it got interesting.
Two updates were released on May 10th:
Net Framework KB5013628
Windows 11 UD KB5013943
I uninstalled both and rebooted the PC. On restart Mailwasher was working again (temporary Yayyy!!!)
I then reinstalled Net Framework Update KB5013628.
Rebooted PC.
On restart Mailwasher was back again.
Then I reinstalled W11 Update KB5013943
Rebooted PC.
Back came the "The application was unable to start correctly (0xc0000135). Click OK to close" massage for two programs. Mailwasher was one. ArmouryswAgent was the other.
Uninstalled KB5013943 again and I've got Mailwasher back, but am being nagged to install the W11 Update again.
