Suresh,
I am having a similar problem in changing a file association, changing the default program for .dst files. I tried the easy way, by right-clicking on the file, going to Properties then changing the file extension. I get a "Windows Explorer have stopped
working" error. I followed your instructions, and I get the same Windows Explorer error. Here are the details of the error:
Problem Event Name: APPCRASH
Application Name: explorer.exe
Application Version: 6.1.7600.16450
Application Timestamp: 4aebab8d
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7600.16559
Fault Module Timestamp: 4ba9b802
Exception Code: c000041d
Exception Offset: 000000000000be59
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033
Additional Information 1: 8762
Additional Information 2: 87626d9db46f3434c4cb892e4775c00b
Additional Information 3: 4f27
Additional Information 4: 4f27e166fe35272654252cb934bb93d4
Can you assist me in getting this fixed?
Patricia S.