Model base point not at 0,0,0

Why i am getting this message when i reopen some files?
How does this point change. I am not change it.

The command is “ModelBasePoint”.
By default, new Rhino 3dm files use 0,0,0
My guess is you may have started by opening perhaps an AutoCAD DWG file or some other file that allows the model base point to be changed.

When this file is inserted into another, the MBP is used as the “handle”.

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