The following bug has been logged on the website:
Bug reference: 13360
Logged by: Lin Pengcheng
Email address: lincpa(at)163(dot)com
PostgreSQL version: 9.4.2
Operating system: windows 7
Description:
pgsql9.4.2 (x86) in win7 (including 32 and 64) for manual installation and
automatically instation, when you run initdb use --locale = C errors occur,
it's indeed a bug.
but I manually install pg9.3 and pg9 .4.0 not have this problem. otherwise
users win8 installed in pg9.4.2(x64) no problem with --locale = C.