Digital BW, The Print

Hi, all

Please excuse the off topic post but I shall need to clean re-install 
Win2k on my PC next week and am saving elsewhere various files.

I cannot find the custom print size files that I use on my Epsons - 
1160. 1290, 2100 and presume they are embedded in a file for each 
machine, but I don't know how to identify these files.

I would appreciate advice/pointers from this knowledgable group.

thanks,

Colin