OK, well in my experience with this, the Index file wasn't helpful by much. In 10 its much better though. In 9.1 you just dug into the directory and had access to all of the native CAD files right there. The key is that all of the CAD files get run through the CAD worker for metadata synchronization before being delivered. This is the key, otherwise the metadata could be completely wrong (attributes, name, etc ).
I don't recall what the situation was regarding the representations. I think if they are PDF's (drawings) they will show but otherwise you need to use winzip/rar to open them. This is typically as a representation is multiple layers and not just a single object (one for the object, one for the markups etc). That's what I recall off hand at least. Don't take it as gospel.
There are some preferences that you can try adjusting and it can be finicky so perhaps something is failing.
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Steve Vinyard
Senior Solution Architect
