Somehow the PATH variable contains a garbage character which in turn leads to an error message from OPTLINK.
This gets added to build.cmd:
set PATH=C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin;C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE;C:\Program Files (x86)\Windows Kits\8.1\bin\x86;D:\Dlang\dmd2\windowsin;%PATH%
D:\Dlang\dmd2\windowsin should actually be D:\Dlang\dmd2\windows\bin
Comment #1 by r.sagitario — 2017-03-13T07:44:36Z
I suspect you've created this issue for one of the RCs for 0.44. It's actually a bug still in the release.