I was able to break SSMS and cause the behaviour you're seeing but only by altering the HKEY_CLASSES_ROOT\ssms.sql.14.0\Shell\Open\DdeExec registry key. I couldn't trigger this by changing the OpenWith preference in...

Are you seeing any errors in Replication?

USE [distribution]
GO
SELECT [time],[error_text]
FROM MSrepl_errors
WHERE CAST([error_text] AS VARCHAR(MAX)) <> '' AND [error_text] IS NOT NULL
ORDER BY [time] DESC

• This reply was modified 5 years, 7 months ago by  HandyD.
• This reply was modified 5 years, 3 months ago by  Dave Convery.

Do you have any entries like this:

HKEY_CLASSES_ROOT\ssms.sql.**.*

with the * being a version number? If so, what do you see under these keys:

HKEY_CLASSES_ROOT\ssms.sql.14.0\Shell\Open\Command
HKEY_CLASSES_ROOT\ssms.sql.14.0\Shell\Open\DdeExec

So DTC is part of windows operating system right? Distributed transaction has nothing to do with SQL Server right?
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