Programming help - how to get the read-only state of PDF file is windows explorer preview is ON?

Programming help - how to get the read-only state of PDF file is windows explorer preview is ON?
I'm developing an application where a file is need to be saved as pdf. But, if there is already a pdf file with same name in the specified directory, I wish to overwrite it. And in the overwrite case, read-only files should not be overwritten. If the duplicate(old) file is opened in windows (Win7) explorer preview, it is write protected. So, it should not be overwritten. I tried to get the '
FILE_ATTRIBUTE_READONLY' using MS API 'GetFileAttributes', but it didn't succeed. How Adobe marks the file as read-only for preview? Do I need to check some other attribute of the file?
Thanks!

Divya - I have done it in the past following these documents. Please read it and try it it will work.
Please read it in the following order since both are a continuation documents for the same purpose (it also contains how to change colors of row dynamically but I didnt do that part I just did the read_only part as your requirement)
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/f0625002-596c-2b10-46af-91cb31b71393
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/d0155eb5-b6ce-2b10-3195-d9704982d69b?quicklink=index&overridelayout=true
thanks!
Jason PV

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