OK, first a little context:
DoCmd.TransferText Method ACC2010
There is a link there for the enumeration.
acexportdelim
As one would expect, by default, a comma deliminated file.
HOWEVER, to get the correct formating one should follow:
How to Create an Export Specification
This information isn't easily found elsewhere and not in MS's website (arrrgh)
Importdelm is the reverse.
acexportmerge
If you have a mailmerge document setup and saved in word (
How to use Mail Merge in Word ) you can use this to send the data to that file that word can later import into the document.
There's no inverse.