Junk Characters while opening a file from webdynpro ABAP

Hi All,
We have a Webdynpro ABAP application ,  in that application from a link we are opening DOC,PDF,JPG........files . When we click on that link it is opening in a Junk charcters .  We have another webdynpro ABAP application in portal , in that application the files are opening fine.
Could you please let me know why it is opening in a junk characters in first application?
Regards,
Krishna.

Hi ,
The files are opening fine in IE7 but when we try to open in IE8 and IE9 they are opening in a junk characters.
I am not sure in another webdynpro ABAP application the files opening correctly in IE 8 .
Regards,
Krishna.

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