Added headers for the msvcrt library.
diff --git a/include/msvcrt/dos.h b/include/msvcrt/dos.h
new file mode 100644
index 0000000..2ea7e14
--- /dev/null
+++ b/include/msvcrt/dos.h
@@ -0,0 +1,44 @@
+/*
+ * DOS definitions
+ *
+ * Derived from the mingw header written by Colin Peters.
+ * Modified for Wine use by Jon Griffiths and Francois Gouget.
+ * This file is in the public domain.
+ */
+#ifndef __WINE_DOS_H
+#define __WINE_DOS_H
+
+
+/* The following are also defined in io.h */
+#define _A_NORMAL 0x00000000
+#define _A_RDONLY 0x00000001
+#define _A_HIDDEN 0x00000002
+#define _A_SYSTEM 0x00000004
+#define _A_VOLID 0x00000008
+#define _A_SUBDIR 0x00000010
+#define _A_ARCH 0x00000020
+
+struct _diskfree_t {
+ unsigned int total_clusters;
+ unsigned int avail_clusters;
+ unsigned int sectors_per_cluster;
+ unsigned int bytes_per_sector;
+};
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+unsigned int _getdiskfree(unsigned int, struct _diskfree_t *);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#ifndef USE_MSVCRT_PREFIX
+#define diskfree_t _diskfree_t
+#endif /* USE_MSVCRT_PREFIX */
+
+#endif /* __WINE_DOS_H */
