I think there will always be someone interested in this, so I post this here.
I've found the answer
here.
When HFS is running with Wine for Linux, it's exactly someway to execute outside GNU/Linux packages:
{.exec|cmd /c start /unix /usr/bin/gedit|out=x.}
{.^x.}
This will run gedit.
More usefully:
{.exec|cmd /c start /unix /usr/bin/libreoffice --convert-to html --outdir "/home/user/converted_document" "/home/user/document/file.docx"|out=x.}
{.^x.}
This will convert "file.docx" to "file.html" with LibreOffice, so the file can be previewed within a browser.
But seems in this way we cannot execute bash based things (like /bin/sh), with a debug message:
0045:fixme:exec:SHELL_execute flags ignored: 0x00000100
We may report this to Wine developers?