diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 51574de..55bf77e 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -56,32 +56,64 @@
 
 SCRIPTS32 =	test50.out test70.out
 
-SCRIPTS_GUI = test16.out
+SCRIPTS_GUI =	test16.out
+
+TEST_OUTFILES = $(SCRIPTS16) $(SCRIPTS) $(SCRIPTS32) $(SCRIPTS_GUI)
+DOSTMP = dostmp
+DOSTMP_OUTFILES = $(TEST_OUTFILES:test=dostmp\test)
+DOSTMP_INFILES = $(DOSTMP_OUTFILES:.out=.in)
 
 .SUFFIXES: .in .out
 
-nongui:	fixff $(SCRIPTS16) $(SCRIPTS) report
+nongui:	nolog $(SCRIPTS16) $(SCRIPTS) report
 
-small:	report
+small:	nolog report
 
-gui:	fixff $(SCRIPTS16) $(SCRIPTS) $(SCRIPTS_GUI) report
+gui:	nolog $(SCRIPTS16) $(SCRIPTS) $(SCRIPTS_GUI) report
 
-win32:	fixff $(SCRIPTS16) $(SCRIPTS) $(SCRIPTS32) report
+win32:	nolog $(SCRIPTS16) $(SCRIPTS) $(SCRIPTS32) report
 
-fixff:
-	-$(VIMPROG) -u dos.vim --noplugin "+argdo set ff=dos|upd" +q *.in *.ok
-	-$(VIMPROG) -u dos.vim --noplugin "+argdo set ff=unix|upd" +q \
-		dotest.in test60.ok test71.ok test74.ok test100.ok
+# Copy the input files to dostmp, changing the fileformat to dos.
+$(DOSTMP_INFILES): $(*B).in
+	if not exist $(DOSTMP)\NUL md $(DOSTMP)
+	if exist $@ del $@
+	$(VIMPROG) -u dos.vim --noplugin "+set ff=dos|f $@|wq" $(*B).in
+
+# For each input file dostmp/test99.in run the tests.
+# This moves test99.in to test99.in.bak temporarily.
+$(TEST_OUTFILES): $(DOSTMP)\$(*B).in
+	-@if exist test.out DEL test.out
+	move $(*B).in $(*B).in.bak
+	copy $*.in $(*B).in
+	copy $(DOSTMP)\$(*B).in $(*B).in
+	copy $(*B).ok test.ok
+	$(VIMPROG) -u dos.vim -U NONE --noplugin -s dotest.in $(*B).in
+	-@if exist test.out MOVE /y test.out $(DOSTMP)\$(*B).out
+	-@if exist $(*B).in.bak move /y $(*B).in.bak $(*B).in
+	-@del X*
+	-@if exist test.ok del test.ok
+	-@if exist Xdir1 rd /s /q Xdir1
+	-@if exist Xfind rd /s /q Xfind
+	-@if exist viminfo del viminfo
+	$(VIMPROG) -u dos.vim --noplugin "+set ff=unix|f test.out|wq" \
+		$(DOSTMP)\$(*B).out
+	@diff test.out $*.ok & if errorlevel 1 \
+		( move /y test.out $*.failed \
+		 & del $(DOSTMP)\$(*B).out \
+		 & echo $* FAILED >> test.log ) \
+		else ( move /y test.out $*.out )
 
 report:
 	@echo ""
 	@echo Test results:
-	@IF EXIST test.log ( type test.log & echo TEST FAILURE & exit /b 1 ) \
-		ELSE ( ECHO ALL DONE )
+	@if exist test.log ( type test.log & echo TEST FAILURE & exit /b 1 ) \
+		else ( echo ALL DONE )
 
 clean:
 	-del *.out
 	-del *.failed
+	-if exist $(DOSTMP) rd /s /q $(DOSTMP)
+	-if exist test.in del test.in
 	-if exist test.ok del test.ok
 	-if exist small.vim del small.vim
 	-if exist tiny.vim del tiny.vim
@@ -92,24 +124,11 @@
 	-if exist Xdir1 rd /s /q Xdir1
 	-if exist Xfind rd /s /q Xfind
 	-if exist viminfo del viminfo
-	-del test.log
+	-if exist test.log del test.log
 	-if exist benchmark.out del benchmark.out
 
-.in.out:
-	-if exist $*.failed del $*.failed
-	copy $*.ok test.ok
-	$(VIMPROG) -u dos.vim -U NONE --noplugin -s dotest.in $*.in
-	@diff test.out $*.ok & if errorlevel 1 \
-		( move /y test.out $*.failed & echo $* FAILED >> test.log ) \
-		else ( move /y test.out $*.out )
-	-del X*
-	-del test.ok
-	-if exist Xdir1 rd /s /q Xdir1
-	-if exist Xfind rd /s /q Xfind
-	-if exist viminfo del viminfo
-
 nolog:
-	-del test.log
+	-if exist test.log del test.log
 
 benchmark:
 	bench_re_freeze.out
diff --git a/src/version.c b/src/version.c
index 53b6cdb..21215ae 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    647,
+/**/
     646,
 /**/
     645,