I know how to read the BMP thumbnail (there are some code here: http://forums.autodesk.com/t5/NET/Another-DWGThumbnail-post/m-p/3007970/highlight/true#M23445), but in 2013, the BMP has been replaced by a PNG. The type seems to be 6 instead of 2 (BMP), but I don't know how the PNG is stored (I've not made further investigation).
Does anyone here have the code or some information about it?
I've found it:
Using ms As New MemoryStream
img = Image.FromStream(ms)
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