Need to convert string data to numbers.

I have string data that I need to convert to numbers so that I can graph it or perform calculations on it. The data (file attached) is in three columns (tab separated) and is in the format time/double/time (saved as a string with Write haracters to File.) When I try Read From Spreadsheet I get 0.0000 for column 1 and 2.0000 for column 3.
Attachments:
testOK.txt ‏1 KB

Hi,
I've done this through scan from file, using %s%f%s%s so I get the relative time, numeric, time, PM
See the attached .vi.
Hope it helps
S.
// it takes almost no time to rate an answer
Attachments:
disect_data.vi ‏46 KB

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