Shaka packager cannot use named pipe on windows for output

[duggaraju]

System info

Operating System: Windows 10/11
Shaka Packager Version: v2.6.1-634af65-release

Issue and steps to reproduce the problem

Named pipes for output works only on Linux not windows.

Packager Command:
packager-win-x64.exe with arguments: --io_block_size 65536 "stream=video,in=\.\pipe\pipe_11316904.mp4,out=\.\pipe\pipe_b13363ff.mp4" --mpd_output truepic.mpd

Extra steps to reproduce the problem?
Named pipes on windows exist only under \.\pipe\ path. and you cannot create a \.\ directory on windows.

What is the expected result?
The packager succeeds.

What happens instead?
The packager tries to create all directories in the path of the file and fails.

<Please attach the input files or email to shaka-packager-issues@google.com.>

C:\Users\krishndu\source\repos\AMSMigrate\AMSMigrate\bin\Debug\net6.0\packager-win-x64.exe with arguments: --io_block_size 65536 --vmodule=*=1 stream=video,in=\.\pipe\pipe_11316904.mp4,out=\.\pipe\pipe_b13363ff.mp4 --mpd_output truepic.mpd
[0526/160621:INFO:demuxer.cc(89)] Demuxer::Run() on file '\.\pipe\pipe_11316904.mp4'.
[0526/160621:INFO:demuxer.cc(155)] Initialize Demuxer for file '\.\pipe\pipe_11316904.mp4'.
[0526/160621:ERROR:local_file.cc(150)] Cannot get file size.
[0526/160621:ERROR:file.cc(399)] Failed to GetFileAttributes of \.\pipe\pipe_11316904.mp4
[0526/160622:ERROR:local_file.cc(85)] Failed to create directory \ ErrorCode 123
[0526/160622:VERBOSE1:status.cc(74)] 5 (FILE_FAILURE): Cannot open file to write \.\pipe\pipe_b13363ff.mp4
[0526/160622:ERROR:packager_main.cc(554)] Packaging Error: 5 (FILE_FAILURE): Cannot open file to write \.\pipe\pipe_b13363ff.mp4
(null)
(null)
C:\Users\krishndu\source\repos\AMSMigrate\AMSMigrate\bin\Debug\net6.0\packager-win-x64.exe finished with exit code 2