Viewing the 3d files with Apple products. Siemens who developed the JT file system that is being used for the 3d drawings did make an IOS viewer. If you search for JT2GO in the App Store you can download the app to either your iPhone or iPad and view the files that way. I used this link to get to the parts and then clicked on the blue part number I wanted to view. Then I clicked on view in JT2GO viewer. Here is a snap shot of the overhead light uses on my 30T.
http://dealer.winnebagoind.com/unitsearch/parts.htm
Sent from my iPhone6 using iRV2 mobile
Robin, Carolyn and Maggie the Schnauzer - 2015 Winnebago Vista 30T, 2014 Smart Car Toad