Sorry I don't have 6.0, but I have attached a picture of the block diagram. To convert the waveform data into a string, you must use the Get Waveform Components function found in the Functions - Waveform palette, and select Y as the element. This produces an array of Y values. Then the Array to Spreadsheet String can be used to convert the entire array into a string, which is concatenated with the header. Then, one file write does it all.