Problem Fopen fail:Fopen returns null handle while opening files

Our web application uses activex control for tranferring some specfic files from client machine to server.

After tranferring 508 files ,Fopen fails to open the log and other files on the local derive, it return a null file handle.

But before the tranfer of 508 file, it returns proper filehandle while opening any files.

Can anybody help me ,why fopen fails in activex control to open any fie on local drive of client machine.

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