https://issues.dlang.org/show_bug.cgi?id=17774 --- Comment #1 from Andre <andre at s-e-a-p.de> --- The default on Windows is now more or less Coff, either X86 or X86_64. (Dub defaults to COFF). Implib is written for OMF and therefore doesn't help much anymore. Therefore I close this issue. --