DATA to Excel feature


By mistake, when I pressed "Data to Excel" feature in Sage 50 Accounts, I pressed NotePad. 

Can someone show me how to find where Sage 50 Accounts makes the associations on which app to use as default in this feature?  I would like to download it as an xlsx extension to fix it.  I can't seem to find where these associations are set up in Sage.   By the way, I have installed Excel in the machine already.