Someone using an older editor may ask for DOC instead of DOCX. A legacy copy can help with that handoff, but newer Word features may change. Keep the DOCX and review the older-format result with the receiving application.
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Microsoft Word Open XML — current default format
Microsoft Word 97–2003 binary format
DOCX is an Open XML package; DOC is an older binary representation. Writing the latter requires an actual DOC encoder, not a ZIP rename or a generic text export. Modern content such as complex tables, content controls, equations, comments, and newer drawing features may be represented differently or may not fit the old format well. The important question is whether the recipient can open and use the result for the intended work, not merely whether a file bearing the .doc extension downloads.
Ask which application and release needs the DOC. Some modern editors accept DOCX directly, eliminating a lossy step. If a DOC really is necessary, choose a source copy and identify features that must remain editable. Compare lists and numbering, section breaks, headers, footers, embedded images, and fields. Open the produced DOC in the target environment if available, because checking it only in the newest editor may hide compatibility problems. Keep the DOCX as the master so content can be corrected without editing a degraded derivative.
A fallback that writes plain text into a file named .doc would be misleading. The output needs a valid DOC container and content round-trip checks. Page counts can change with font and layout differences, and file size may rise or fall. Open the downloaded DOC in the intended older application to check its content and layout.
If a government form or legacy business application demands DOC, obtain a sample of the exact accepted file before building the export. File extensions do not prove that every old parser accepts the same structures. Open the result there, edit a field, save it again, and compare the content. That round trip is more meaningful than a successful download and can reveal unsupported tables or numbering.
If the recipient's software accepts it, keeping DOCX avoids a backward conversion.
Not necessarily. Older format and application limitations can change layout.
Their behavior must be checked in the recipient's actual editor.
No. The internal format must be rewritten by a real encoder.
No. A released route would also need a clear failure for unsupported DOCX features instead of silently discarding them.
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