I couldn't find a built in way to do this. A manual way to do it is to connect to the file as a text file (or paste the data in) which will give you one dimension for all of the data.
Then create calculated fields using the left() and right() functions to break up the record into the fields you want - naming them and setting the data type as you go.
Its not perfect - and with a very large file might slow down a bit - but it should work.
Hope that helps