Import XML 1.2 using Geopak DTM Tools

I'm using SS1 Microstation and Geopak and have imported a land xml 1.2 surface using DTM tools.  When I do this, it creates a .tin file which is fine except the the import added zome 0 elevaion points around the bourdary of my surface.  I was going to use the DTM/Edit/Z Range clip to get rid of the 0 elevation points, but it requires a .dat file.  How do you create a .dat from a .tin?  Or better yet, why did it add points of 0 elevation.  I have reimported the XML file into another application and it looks fine so problem is occuring upon import into Geopak DTM tools.

Thanks

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