unable to open .RTF files in server machine from client machine

[Naresh_1210]

i have configured by web service to IIS .
and i'm referring that web service in my local windows application.
and when ever i try to open a .rtf file through web service it is returing "Object instance set to null" .

it is running locally fine, but when configured to IIS it is giving problems.
i even given impersonate =true with valid user id and password in my web service web config file .



still it is not done.

is it a issue with IIS or other settings .
my machine is running on win 2008 server with IIS 7.0. and MS office 2007