This really all depends on the way you are saving the file in excel, If you are saving the file in the normal excel way .xls you will get zeros but if you save it as .txt you should not. Try saving your excel file as .txt and see what happens. also when using the read rom spreadsheet function you will also need to change the format specifier to x instead of f. Try these and see if they help.
If not post some code in LV 7.0 or screenshot of your code.
Joe.
"NOTHING IS EVER EASY"