OFX import directed to wrong account

[Tony Bazeley]

Hi,

While I've been using gnucash for almost 12 months my skills are pretty 
basic.
I've come across a problem - an OFX import has  decided that it prefers 
another account to the one I wish.

 From my reading, I understand that at some stage I've inadvertently 
associated that particular OFX import with an undesired account.
I believe the OFX-account relationship is set in an XML file with no 
direct user interface.

I'd like to correct this mistake so that OFX file A is directed into 
account A rather than account B, and have had a couple of thoughts:

* Finding the XML file and editing it directly

* The following sequence:
     exporting the contents of account B,
     deleting account B,
     importing OFX file A into account A (I hope) and then
     recreating account B

My web research to date hasn't provided any answers and I'd very much 
appreciate any advice on how to proceed

TIA
Tony