Don’t parse the pipeline as text when it is directed from an EXE to another EXE or file. Keep the bytes as-is.

Currently PowerShell parses STDOUT as string when piping from an EXE, while in some cases it should be preserved as a byte stream, like this scenario:

``` powershell
curl.exe http://whatever/a.png > a.png
```

or

``` powershell
node a.js | gzip -c > out.gz
```

Affected patterns include: `native | native`, `native > file` and (maybe) `cat file | native`.
