ZModeler forum

WHEN I IMPORT Z3D
Not a ZModeler 1.x version Z3D file. file:oldZ3DImportExport.cpp line:304
BUT OTHER FILES THAT NEVER TOUCHING CAN IMPORT. BUT WORKED FILES LIKE AUTOSAVE.Z3D OCCUR ERROR. AND SORRY BAD ENGLISH.

Z3d files made by ZModeler2 series and ZModeler3 series should be File/Opened, not File/Imported.
An import of ".z3d" files allows to import files created by the very first evaluation of ZModeler (1.x series), that has a very different data layout and setup;