How to detect the signature of a file

Hi,

I got source code (using winverifytrust API ) which detects whether

the given file is signed or not.

source code link :

http://msdn.microsoft.com/en-us/library/aa382384.aspx

I created an exe with that code and tested I faced one issue

when I pass the "C:\Windows\System32\ieframe.dll" it is showing that

this file is not signed.

If I check the same file using "sigverif" ieframe.dll is signed.

Please can any tell me what might be the reason for the above.

I am trying to implement the SIgnedCode class in VC++ (MFC or Win32) I

did not get any information on this in the web.

Please can any suggest me how to proceed.

Thanks,

Manjunath.M