Find the file called "CUSTOM.DIC" and open it in Notepad (or any plain text editor).
I guess that is easier said than done for those who don't know where to find it.
You should note that some other Microsoft applications (i.e. Microsoft Works) share the "CUSTOM.DIC" file. So
if you edit it, those other programs are affected too.
The location of the file "CUSTOM.DIC" on your hard drive depends on the version of Microsoft Windows and/or
Microsoft Office you have.
For example, Windows 2000 and Windows XP users will find it in
C:\Documents and Settings\User Name\Application Data\Microsoft\Proof\
Replace "User Name" with the name used to log in to Windows. So if you are logged in to Windows as John Smith,
you'll find it in
C:\Documents and Settings\John Smith\Application Data\Microsoft\Proof\
If you have an older version of Microsoft Windows (i.e. Microsoft Windows 98 SE) and/or an older version of
Microsoft Office (i.e. Microsoft Office 97), you'll probably find it in the Microsoft Office installation
folder.
Which would most likely be
C:\Program Files\Microsoft Office\Office\
If you still can't find the "CUSTOM.DIC" file, use the Find feature in Microsoft Windows.
Click "Start" (a.k.a. the Start Menu)
Point to "Find"
Click "For Files or Folders..."
Find the box titled "Search for file or folders named" and type "CUSTOM.DIC" (without quotes).
-- If you are on Windows XP using Simple Search, find the box titled "All of part of the file name" and type
"CUSTOM.DIC" (without quotes).
Click the "Search" button.