Maybe this can get you started. Change path to yours.
Sub nhatruong306()
Workbooks.OpenText Filename:="C:\YOUR PATH\data\YOUR FOLER\t1_300nm_0.001.txt", Origin _
:=xlWindows, StartRow:=1, DataType:=xlDelimited, TextQualifier:= _
xlDoubleQuote, ConsecutiveDelimiter:=False, Tab:=True, Semicolon:=False, _
Comma:=False, Space:=False, Other:=False, FieldInfo:=Array(Array(1, 1), _
Array(2, 1), Array(3, 1), Array(4, 1), Array(5, 1), Array(6, 1)), TrailingMinusNumbers _
:=True
ActiveWorkbook.SaveAs Filename:="C:\YOUR PATH\data\YOUR FOLER\t1_300nm_0.001.xls", _
FileFormat:=xlNormal, Password:="", WriteResPassword:="", _
ReadOnlyRecommended:=False, CreateBackup:=False
Columns("B:B").ColumnWidth = 17.14
Columns("B:B").NumberFormat = "0.0000000000"
Columns("A:A").Delete Shift:=xlToLeft
Columns("B:B").Delete Shift:=xlToLeft
ActiveWorkbook.Save
End Sub
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