Unformatted AutoCorrect entries which could be shared among Office applications are stored in "MSO<LCID>.acl" files according to language.
You may go to Word > Options > Proofing > AutoCorrect Options, make any changes desired in the various tabs and controls in the dialog box, then push out the .acl file to all users via GPO to their location %APPDATA%\Roaming\Microsoft\Office
.
On my test environment, there is a MSO1033.acl file, "1033" is the LCID of English.
Hope the information could be helpful.
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