You can save your workbook in XML format but you don't get much control
of how the XML looks.

This will get you started, it writes :
<xml
<datasomedata</data
</xml

to a file named my.xml


Open "C:\my.xml" For Output As #1
Print #1, "<xml"+ Chr(10)
Print #1, "<datasomedata</data+ Chr(10)
Print #1, "</xml" + Chr(10)
Close #1

I haven't done reading in a while, but last I checked you had to add
MSXML 4.0 and that added an XML library to your references that
provides all the normal DOM subs and functions.

Excel will read XML natively, you can access the worksheet and cells it
creates. Try that first.