In make_installer.pl is the code:

	my $loglanguagestring_orig = $loglanguagestring;
	if (length($loglanguagestring) > 120)
	{
	    chomp(my $shorter = `echo $loglanguagestring | md5sum | sed -e "s/  -//g"`);
	    $loglanguagestring = $shorter;
	}

As such I don't understand what's so magic with the length 120, but anyway, the
problem on a Cygwin-based build is that the md5sum output looks like:

04d214ac94b0d2f46c621ac6bd6cc8b1 *-

Note just one space and an asterisk after the hex digits. Thus the sed command
fails to remove them.

Trivial fix:

--- solenv/bin/make_installer.pl
+++ solenv/bin/make_installer.pl
@@ -549,7 +549,7 @@
 	my $loglanguagestring_orig = $loglanguagestring;
 	if (length($loglanguagestring) > 120)
 	{
-	    chomp(my $shorter = `echo $loglanguagestring | md5sum | sed -e "s/  -//g"`);
+	    chomp(my $shorter = `echo $loglanguagestring | md5sum | sed -e "s/ .*//g"`);
 	    $loglanguagestring = $shorter;
 	}
 

Of course, the Perl way would be to use Digest::MD5's md5_hex() function for
this instead of running three external programs, but I digress...

After fixing this there are still other problems that pop up if one includes
"too many" languages in a multi-language installer, but I'll open separate
issues for those once I have investigated further.