From the info provided, it appears to me that Tony is trying to move the mesh to the origin 0,0,0.
If that's the case then Silo can save .stl files but can't open them.

If you have Rhino you can open & re-position the mesh or re-save as STL file using ExportWithOrigin.

Or get the free Rhino evaluation version which has 25 saves.

EDIT:

Seems you have your answer here: http://www.vectric.com/forum/viewtopic.php?f=12&t=14173

Have you tried this? That would be the simplest way if it works.

Sorry for the delay in letting you know if your help, helped. It did.
Cut 3D seems to want the x0y0 in the corners or center when it is drawn in the model or I have problems.
Rino did allow moving the stl file, open and re save it with the x0y0 being moved. Then sent back to Cut 3D.
I am now learning how to the zero the machine and the work piece and getting the zeros lined up when cutting.

Tony