Hello,
Yes, I have tried the steps mentioned in your given link, but I am using Win7 (64 Bit) OS to perform test. So I have changed the relevant windows settings as well. But didn't worked.
Now, I have define the same method in .net dll and access the same in testcomplete. It successfully gives me correct strings with correct letters, but now I am not able to open these files using fullname (including path) in my test application. For that I have submitted a different support request (ID: M0086876). Kindly see the issue reported and reply.
Thanks,
Rajender Mehta