I could export from PL4.3 to Nik PreSharpener and OutputSharpener,
used an older file from Nikon D800 (36 MPix), exaggerated with resizing …
and both TIFF-files came out > 900 MB (double size version) without any problem.
[ note: installation of Nik4.0.8.0 plus re-installation of Nik3.3
– see Issues with Nik4 - #8 by Wolfgang,
but don’t think it makes a difference in this case as only SEP3 and Viv3 are new ]