redirect unicode format output

from powershell windows I entered this command:
cmd /c "dir > $env:temp\xxx.txt"
the output file xxx.txt is in ascii format. But if I entered this command
instead:
cmd /c dir > $env:temp\xxx.txt
(without double quote) xxx.txt is in unicode format.

Can someone give me an explanation?

Thanks.

"hn" <hn@discussions.microsoft.com> wrote:
> cmd /c "dir > $env:temp\xxx.txt"
> cmd /c dir > $env:temp\xxx.txt

My guess is that:

*) in the first case redirection to a file is done by cmd (i.e. PowerShell
runs cmd; cmd runs dir and redirects its output to a file in ASCII encoding,
then PowerShell does nothing having no cmd output);

*) in the second case redirection to a file is done by PowerShell (i.e.
PowerShell runs cmd; cmd runs dir and sends output to the standard output
stream, then PowerShell redirects this cmd output to a file in Unicode
encoding).

--
Thanks,
Roman