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Write data in file using "fopen( )" in C51 - µVision2

Hello everybody giving a helping hand,

got me some trouble here. I was making a program that reads out the duty cycle of an ADXL202 sensor. Everything works, except the part were i want to print my data in a file using this :

 FILE *stream, *fopen();

                 if ( (stream = fopen(...)) != NULL)
                                 fscanf(stream,''%s'', string);

Ok this is were my problems start. The compiler gives me the error that he doesn't know this type FILE ore the function fopen (). This seems to be logical to me since i looked in my stdio.h header and found nothing really according to that declaration.
Is there a posibility that this is stored in another source file or does not exist???
Or .... how do i get my data's in a *.txt file ???

Thanks for the help i'm about to receive :))

P.S: Im using a 80C535 µC, sorry for not mantuening

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