diff --git a/sdk/tools/mkisofs/schilytools/libschily/wctype.c b/sdk/tools/mkisofs/schilytools/libschily/wctype.c
new file mode 100644
index 0000000..69cfac0
--- /dev/null
+++ b/sdk/tools/mkisofs/schilytools/libschily/wctype.c
@@ -0,0 +1,98 @@
+#if defined __REACTOS__ && defined(_MSC_VER) && _MSC_VER == 1700
+#pragma message("Warning VS2012 extrawurst: wctype should come from MS CRT")
+// due to bugs in libschily the VS2012 does fail to link wctype-functions
+// used by match.c and fnmatch.c. But VS2010/VS2013 can properly link the MS CRT versions of it.
+// Therefore we provide libschily implementation of wctype.c for VS2012.
+
+
+/* @(#)wctype.c	1.3 17/08/13 Copyright 2017 J. Schilling */
+/*
+ *	Emulate the behavior of wctype() and iswctype()
+ *
+ *	Copyright (c) 2017 J. Schilling
+ */
+/*
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * See the file CDDL.Schily.txt in this distribution for details.
+ * A copy of the CDDL is also available via the Internet at
+ * http://www.opensource.org/licenses/cddl1.txt
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file CDDL.Schily.txt from this distribution.
+ */
+
+#include <schily/ctype.h>
+#include <schily/wctype.h>
+#include <schily/wchar.h>
+#include <schily/string.h>
+#include <schily/schily.h>
+
+#ifndef	HAVE_WCTYPE
+LOCAL struct wct {
+	char		*name;
+	wctype_t	val;
+} wct[] = {
+	{"alnum", 1},
+	{"alpha", 2},
+	{"blank", 3},
+	{"cntrl", 4},
+	{"digit", 5},
+	{"graph", 6},
+	{"lower", 7},
+	{"print", 8},
+	{"punct", 9},
+	{"space", 10},
+	{"upper", 11},
+	{"xdigit", 12},
+	{ NULL, 0}
+};
+
+wctype_t
+wctype(n)
+	const char	*n;
+{
+	register struct wct *wp = wct;
+
+	for (; wp->name; wp++) {
+		if (*n != *wp->name)
+			continue;
+		if (strcmp(n, wp->name) == 0)
+			return (wp->val);
+	}
+	return (0);
+}
+
+int
+iswctype(wc, t)
+	wint_t		wc;
+	wctype_t	t;
+{
+	switch (t) {
+
+	case 1: return (iswalnum(wc));
+	case 2: return (iswalpha(wc));
+#if defined(HAVE_ISWBLANK) || ((MB_LEN_MAX == 1) && defined(HAVE_ISBLANK))
+	case 3: return (iswblank(wc));
+#else
+	case 3: return (isspace(wc));
+#endif
+	case 4: return (iswcntrl(wc));
+	case 5: return (iswdigit(wc));
+	case 6: return (iswgraph(wc));
+	case 7: return (iswlower(wc));
+	case 8: return (iswprint(wc));
+	case 9: return (iswpunct(wc));
+	case 10: return (iswspace(wc));
+	case 11: return (iswupper(wc));
+	case 12: return (iswxdigit(wc));
+
+	default:
+		return (0);
+	}
+}
+#endif	/* HAVE_WCTYPE */
+#endif //__REACTOS__
diff --git a/sdk/tools/mkisofs/CMakeLists.txt b/sdk/tools/mkisofs/CMakeLists.txt
index 37d85bc..b2462e5 100644
--- a/sdk/tools/mkisofs/CMakeLists.txt
+++ b/sdk/tools/mkisofs/CMakeLists.txt
@@ -57,6 +57,7 @@ add_library(libschily
     schilytools/libschily/strlcat.c
     schilytools/libschily/strlcpy.c
     schilytools/libschily/uid.c
+    schilytools/libschily/wctype.c
     schilytools/libschily/zerobytes.c)
 
 add_library(libsiconv
diff --git a/sdk/tools/mkisofs/schilytools/include/schily/wctype.h b/sdk/tools/mkisofs/schilytools/include/schily/wctype.h
index 56fe3e7..d8ec4f4 100644
--- a/sdk/tools/mkisofs/schilytools/include/schily/wctype.h
+++ b/sdk/tools/mkisofs/schilytools/include/schily/wctype.h
@@ -46,7 +46,7 @@
 
 #if	defined(HAVE_ISWPRINT) && defined(USE_WCHAR)
 #ifndef	USE_WCTYPE
-#undef	USE_WCTYPE
+#undef	USE_WCTYPE //FIXME: bug! This is #define USE_WCTYPE in newer versions, see https://github.com/roytam1/schilytools/tree/master/include/schily/wctype.h for surrounding changes also
 #endif
 #endif
 

warning: LF will be replaced by CRLF in sdk/tools/mkisofs/schilytools/include/schily/wctype.h.
The file will have its original line endings in your working directory.