.ACL File Extension
File TypeAutoCorrect List File
What is an ACL file?
Stores a list of corrections used by the AutoCorrect feature in Microsoft Office programs; used for automatically correcting grammar and spelling mistakes; AutoCorrect lists can be customized within Microsoft Office programs and are not meant to be edited manually.
Typically, one global AutoCorrect list is created per language for each user. Changes made in one Office program affect all other Office applications.