The "Read Waveform Attributes.vi" probably isn't what you are looking for. There are no predefined attributes in LabVIEW 6.0, although there are future plans to create some, such as channel name and channel unit. Currently, all you do is set properties and then read them back.
I would recommend just using the "Export Waveforms to Spreadsheet File.vi" if you are wanting to write waveform data to a text file. If it isn't quite what you are looking for, you can always modify it but it would be a great starting point. Let me know if you have any specific questions on modifying it.
Thanks.
Matt Kisler
Applications Engineer
National Instruments
http://www.ni.com/ask