update query
You should be able to do it with an update query.
FIRST, DO THIS ONLY ON A BACKUP COPY OF YOUR DATA TO MAKE SURE IT WORKS AS EXPECTED.
For example, assume a table called tblLink with a hyperlink field called Link.
And, assume that you have a value in the field of "http://www.access-programmers.co.uk"
and you wish to change that to "http://www.access-programmers.co.us"
The value is 36 characters in length, so you want to change only the last two.
UPDATE
tblLink
SET
tblLink.Link = Left([Link],34) & "us";
Obviously, this is not your situation, but you should be able to adapt this to fit your needs using various string functions.
HTH
