Feel free to use the big white space under the subject line to make your
question clear.
A flat file is an unindexed file, usually either outside any database or
used as the (not very efficient) method of implementing a database. There's
no "flat file in Access". You could, if you wished, use an Access table as
though it were a flat file, but that would be neither wise nor efficient.
An Excel worksheet with all the information on the one worksheet (which
normally will lead to a lot of redundant information in the rows) is being
used as a "flat file", but Excel has capabilities that extend beyond the
"flat file" approach.
Larry Linson
Microsoft Office Access MVP