If Microsoft Word icon is blank or missing, & not showing correctly or properly on .DOC & .DOCX document files of Office, then see this fix.

In the Compare Documents dialog box, choose the two documents you want to compare. To do that, click the Folder icon on the left, in the Original document section, and select the Word document.

But, do note that this feature won’t recover document formatting, media elements, drawings, and other content that are present in the document. But, plain text with field text, headers, footers ...

These apps help you manage your team’s documents, media assets, and other content in Teams. ... (After you click the + icon, search for “Microsoft Whiteboard” to install it in a tab.) ...