Facing problem in fopen

I am using vc10 with xp3 professional. I am trying to open the file, but it is giving error i.e Invalid Argument.

fd = fopen("D:\Matadeen\ftpcmds.txt", "rb"); /* open file to upload */


Please help me out.
FILE* fd = fopen("D:\\Matadeen\\ftpcmds.txt", "rb"); /* open file to upload */
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