Where are MasterCook's cookbook files?

MasterCook 11 stores all cookbooks and data in the Public Documents folder on your computer. The default location for these files is: 

In Windows XP (C:\Documents and Setting\All Users\Documents\MasterCook). 

In Vista and Windows 7 (C:\Users\Public\Documents\MasterCook). 

If you wish for your MasterCook 7 and higher cookbooks to appear you can move them 
to the above locations and place them in the My Collections directory.
Then launch MasterCook. If your recipes do not appear in the cookbook list, hit F5
to refresh the master list.