Close Excel File after getting data from it

Hi!
I have a big vi to make data aquisiton from a spectrometer. I have the aquisition part and the "save to spreeadsheet" part also. Now I want to make a button to open the data from the excel file and show it in a xy chart. I had some problems but now its working except one important thing. After I read the data from the file and have it in the chart, it seems like the file it's not closed cause if I try to open it in excel, it "hangs" the computer. If I stop the vi, there's no problem. What can I do? I saw here in the forum that its not necessary to open or/and close spreedsheet files but i think this problem is because the file it's not "released" or something. Any help would be great.
Here's the part of the vi that reads the file, and the file itself.
Thanks in advance

Strange. I made the attachment. Anyway, here it is:
Attachments:
open data file.vi ‏17 KB
scan 11h21m17s .xls ‏44 KB

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