A .zw1 file is not a standard CAD drawing but a project backup EPLAN UK Blog . Use one of these methods to open it: Double-click
Is the file a or a complex 3D assembly model ? Share public link zw1 to dwg converter
Go to File > Open and navigate to your .zw1 file. If it doesn't appear immediately, change the file type dropdown in the dialog box to All Files ( . ) or ZW3D Files . zw1 to dwg converter
The need to convert ZW1 to DWG arises from the need for collaboration: zw1 to dwg converter