Querying CSV file through VBA without knowing the header

Hi,

I'm creating a macro that queries a CSV file that a user chooses, and saves the result of only the lines that meet a certain criteria.

The CSV file contains 7 columns, but 2 of which the headers are dates so they vary.  I need a way to be able to either find out the header names before running the query, or specify in the query through a header number.

e.g.
My file contains the following CSV file:
Curr,Days,1/1/2013,1/2/2013,Change,%Change
USD,1,100,100,0,0
JPY,1,1000,1000,0,0
....

Below is my code

objConn = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
        "Data Source=" & dSource & ";" & _
        "Extended Properties=""text;HDR=Yes;FMT=Delimited(,)"";Persist Security Info=False"
objConn.Open



SqlQry = "SELECT * FROM " & dfile & " " & _
            "WHERE ([% Change] >= 5 OR [% Change] <= -5) "

Rcdset.Open SqlQry, objConn

For i = 0 To Rcdset.Fields.Count - 1
    data_ws.Cells(1, i + 1).Value = Rcdset.Fields(i).Name
Next i

data_ws.Cells(2, 1).CopyFromRecordset Rcdset

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So basically I'm looking for anything that has a 5% change, and I also need to look for any that didn't have data on today's column.  So in this case, it would be WHERE 1/2/2013 = '' but how can I chose this column/header when the value is constantly going to change?