skiptostring

I just can not seem to grasp how this works or if I am using the correct function.
I start with
fname = "C:\\test\\test.model"  --file name
f = fopen fname "rb"   --open file in read only format

now I have an unspecified length of binary data and then the word DataData

what is the correct funtion to skip ahead to that text and set my position to there.