https://bugs.winehq.org/show_bug.cgi?id=7106
--- Comment #33 from Jeff Zaroyko jeffz@jeffz.name --- (In reply to Chebanenko Igor from comment #32)
Looks like Stage patchset is krnl386.exe related. Check this: https://sourceforge.net/p/freedos/svn/HEAD/tree/kernel/trunk/kernel/
Chebanenko, these comments are not entirely appropriate. For example freedos is under the GPL, while Wine is under LGPL.
There is already a patch in wine-staging. Per the previous instruction, if you need to run the installer, use wine-staging.