Each logged-in user has a default custom dictionary accessible within PowerPoint and other Microsoft Office programs called RoamingCustom.dic. Additionally, you can create and use many more custom dictionaries. Over time, your custom dictionaries may become a very useful resource, especially since any custom dictionary loaded is used by all the Office applications such as Word, Excel, PowerPoint, and Outlook. To share the dictionary files (.dic), you first need to find out where they are stored on your computer.
Learn how to share custom dictionaries in PowerPoint 365 for Windows.

