Hello,
If the spreadsheet file is tab-delimited text data, you can very easily import it into your LabVIEW program...if it is numeric data, you can simply use the "Read from Spreadsheet File" VI in your File I/O palette. If it is string data, you can use the "Read Lines from File" VI, then you can use the "Spreadsheet string to Array" function to format the data into string (%s) format.
I hope this suggestion helps...it would probably be easier to implement than ActiveX...provided your spreadsheet data is stored in tab-delimited ASCII format.
Good luck, and have a pleasant day.
Sincerely,
Darren N.
NI Applications Engineer