Microsoft Project Export File 4.0

Unknown

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The Microsoft Project Export file or Microsoft Project Exchange file format is for earlier version of Microsoft Project to exhange project data with other Project Management software. Discontinued with Project 2000.

Identify it

Extensions	`.mpx`
MIME types	`application/x-project`
Signatures	`4d5058` at byte 0 (Microsoft Project Export File 4.0)
PRONOM	`fmt/342`
Wikidata	`Q61913269`

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Open it

Microsoft Projectreads and writes · proprietary license
Microsoft Project 4writes

Convert it

No conversion recorded. One of the tools above may export it; search for a chain.

Sources

PRONOM fmt/342
Wikidata Q61913269

From PRONOM, Wikidata. Updated 2026-10-20.

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