To publish a * .dxf file from an Inventor sheet metal model, you can select in the specific publication settings:
Defer updates – the model will be open, but there will be no possible update, e.g. from derived components.
Publishing application setting:
Vault Inventor Server – publishing will be run by Vault Inventor server, which is part of Vault client (licensed with Vault client).
Inventor Application – full Inventor.
DXF optimization – to this field copy content of optimization*.ini file, obtained for example in Inventor for detailing set up resulting *.dxf file.