I have set the %HOME% environment variable on my Windows installation.
In that folder I have put a file called _netrc. Inside that file I have:
machi
I've been bashing my brains against this one too and I have a solution different from those posted.
Ensure that your _netrc file is Ascii encoded. If using ECHO redirecting to a file on standard out, Windows uses the UCS-2 LE BOM file format. Some other apps might also have a different default from Ascii.
So, if creating this file via script, use Set-Content -Encoding Ascii rather than a STOUT redirect. If creating this file via notepad++ or vim, ensure the encoding is set to ASCII.