File types supported for previewing files in OneDrive, SharePoint, …
https://support.microsoft.com/en-us/office/file-types-supported-for-previewing-files-in-onedrive-sharepoint-and-teams-e054cd0f-8ef2-4ccb-937e-26e37419c5e4
WEBIf Office Online Server is installed, document preview can be shown in modern document libraries for these file types: Acrobat (PDF), PowerPoint (POTM, POTX, PPSM, PPSX, PPT, PPTM, PPTX), Rich Text (RTF), Word (DOC, DOCM, DOCX, DOTM, DOTX). Here’s the full list of file types supported.
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