Microsoft Word 4/5 for Mac template file
File type: Document file
A .sdbn file is a template used by Microsoft Word 4 or 5 for Mac.
It provides reusable document content and layout for creating documents in those versions of Microsoft Word.
File type category:
Document file
Date updated: September 27, 2026
The SDBN file extension belongs to Microsoft Word 4 and 5 for Mac, Microsoft's word-processing software for classic Macintosh computers. An SDBN file contains template content that Word can use as the starting point for new documents.
These templates are associated with the older Mac versions of Microsoft Word rather than with current Word for macOS. The format is obsolete and is no longer commonly used.
Open an .sdbn file with Microsoft Word 4 or 5 for Mac. The original software requires a compatible classic Macintosh environment and does not run natively on current macOS versions.
Current versions of Microsoft Word may not recognize this legacy template format. If the file is important, open it in the original software or a compatible older environment and save its contents in a newer format.
If Microsoft Word 4 or 5 for Mac can open the file, create a document from the template and save or export that document in a format supported by a current word processor.
Some template features or layout details may not transfer fully during conversion, so the resulting document should be checked in the newer software.
Software applications that can open sdbn files:
Apple macOS / Mac OS X
Software applications that can edit sdbn files:
Apple macOS / Mac OS X
Software capable of saving sdbn files:
Apple macOS / Mac OS X
Software applications that handle other tasks involving sdbn files:
Apple macOS / Mac OS X
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