To create a Visio file without starting Visio, you would have to write the
Visio file format, of course! There are two ways to do this:
1. Crack the Visio file format. (not recommended)
2. Learn the Visio xml file format (recommended)
Search for "Visio 2003 SDK" online and you will get info on the Visio xml
file format.
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Hope this helps,
Chris Roth
Visio MVP