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>One of our engineers made Visio (Visio 5.0) drawings directly into a
>PowerPoint presentation (Insert/Object/New - Visio 5).
>Now we want to edit the drawings but ...
Do you mean that the PowerPoint files carry the only copies of the drawings?
If so, you probably won't be able to edit the work. The engineer should
have saved copies in the native Visio format for this purpose.