use the FileSystemObject
you can get to it through the Microsoft Scripting Runtime Ref. and or the Windows Scripting Host Ref.
with that you can use OpenTextFile, this will work on csv and txt files....
As for the .xls you need a reference to Microsoft Excel then you can access .xls files by doing things like
Dim oxl as Excel.Application
Dim wb as Excel.Workbook
Dim ws as Excel.Worksheet
set oxl = new Excel.Application
set wb = oxl.Workbooks.New (or oxl.Workbooks.Open "file.xls")
set ws = wb.Worksheets(1)
bother me and I will replace you with a very small .shell script