Danny,
When you create a revision the project files (including Visio and AutoCAD drawings) are placed in a zip file in the project folder. The zip file will have a name like RevisionName.zip.
D-Tools has a feature Promote Revision which will bring the revision back as the project file. To promote a revision click "Selected Project Details" tab and select the revision in the "Revisions" tab. Select the Revision file and you can do a "Promote Revision". However Promote Revision has a bug in the current 5.5 release - see
http://www.support.d-toolsblog.com/s...ote-correctly/.
This bug will be fixed in the next service pack.
To answer your question however the Visio and AutoCAD files are added to a zip file when the revision is made and will be in the project folder.