diff --git a/build/win64/gen-html.bat b/build/win64/gen-html.bat
new file mode 100644
index 000000000..25823490a
--- /dev/null
+++ b/build/win64/gen-html.bat
@@ -0,0 +1,93 @@
+@setlocal
+@REM Build HTML from log of 'version.txt'
+@REM Versify the tools used
+@call verhist -? >nul
+@if ERRORLEVEL 1 (
+@echo Unable to run 'verhist.pl'! *** FIX ME ***
+@exit /b 1
+)
+@call emailobfuscate -? >nul
+@if ERRORLEVEL 1 (
+@echo Unable to run 'emailobfuscate.pl'! *** FIX ME ***
+@exit /b 1
+)
+
+@set TMPFIL1=..\..\version.txt
+@if NOT EXIST %TMPFIL1% (
+@echo Can NOT locate %TMPFIL1%, in %CD% - *** FIX ME ***
+@exit /b 1
+)
+
+@call dirmin %TMPFIL1%
+
+@set /P TMPVER=<%TMPFIL1%
+
+@echo Current version '%TMPVER%' ...
+@set TMPLOG1=..\..\..\temp-%TMPVER%.log
+@set TMPLOG2=..\..\..\temp2-%TMPVER%.log
+@set TMPLOG3=..\..\..\temp3-%TMPVER%.log
+
+@if EXIST %TMPLOG1% goto GOTL1
+@call git log -p %TMPFIL1% > %TMPLOG1%
+@if NOT EXIST %TMPLOG1% (
+@echo Gen of %TMPLOG1% FAILED! *** FIX ME ***
+@exit /b 1
+)
+:GOTL1
+@echo Got log 1 '%TMPLOG1%' ...
+@call dirmin %TMPLOG1%
+
+@if EXIST %TMPLOG2% goto GOTL2
+@call verhist %TMPLOG1% -o %TMPLOG2%
+@if EXIST %TMPLOG2% goto GOTL2
+@echo Gen of %TMPLOG2% FAILED! *** FIX ME ***
+@exit /b 1
+:GOTL2
+@echo Got log 2 '%TMPLOG2%' ...
+@call dirmin %TMPLOG2%
+
+@set TMPV=%1
+@if "%TMPV%x" == "x" (
+@echo Give the cut-off version, like 5.6.0, to continue..
+@exit /b 1
+)
+
+@echo Doing: 'call grep %TMPV% %TMPLOG2%' ...
+@call grep %TMPV% %TMPLOG2%
+@if ERRORLEVEL 1 (
+@echo Failed to find '%TMPV%'... check the file '%TMPLOG2%'
+@exit /b 1
+)
+
+@set TMPD=%~2
+@if "%TMPD%x" == "x" (
+@echo Give the DATE of the cut-off, like 'Sat Nov 25 14:50:00 2017 +0100', to continue...
+@exit /b 1
+)
+
+@if EXIST %TMPLOG3% goto GOTL3
+@call git log "--decorate=full" "--since=%TMPD%" > %TMPLOG3%
+@if EXIST %TMPLOG3% goto GOTL3
+@echo Failed to generate 'git log ...' - *** FIX ME ***
+@exit /b 1
+:GOTL3
+@echo Got log 3 '%TMPLOG3%' ...
+@call dirmin %TMPLOG3%
+
+@REM at last generate the release HTML
+
+@set TMPHTM=..\..\..\temp-%TMPVER%.html
+@if EXIST %TMPHTM% goto GOTL4
+@call emailobfuscate %TMPLOG3% -o %TMPHTM% -a %TMPVER% -i
+@if EXIST %TMPHTM% goto GOTL4
+@echo FAILED to generate %TMPHTM%! *** FIX ME ***
+@exit /b 1
+:GOTL4
+@echo Got HTML '%TMPHTM%' ...
+@call dirmin %TMPHTM%
+
+@REM All success - check image
+@call start %TMPHTM%
+
+@REM eof
+
diff --git a/src/tidylib.c b/src/tidylib.c
index 75cb1d964..4d5751062 100644
--- a/src/tidylib.c
+++ b/src/tidylib.c
@@ -1125,19 +1125,26 @@ int TIDY_CALL  tidyParseSource( TidyDoc tdoc, TidyInputSource* source )
     return tidyDocParseSource( doc, source );
 }
 
-
+#ifdef WIN32
+#define M_IS_DIR _S_IFDIR
+#else // !WIN32
+#define M_IS_DIR S_IFDIR
+#endif
 int   tidyDocParseFile( TidyDocImpl* doc, ctmbstr filnam )
 {
     int status = -ENOENT;
-    FILE* fin = fopen( filnam, "r+" );
-
-    if ( !fin )
+    FILE* fin = 0;
+    struct stat sbuf = { 0 }; /* Is. #681 - read-only files */
+    if ( stat(filnam,&sbuf) != 0 )
     {
         TY_(ReportFileError)( doc, filnam, FILE_NOT_FILE );
         return status;
     }
-
-    fclose( fin );
+    if (sbuf.st_mode & M_IS_DIR) /* and /NOT/ if a DIRECTORY */
+    {
+        TY_(ReportFileError)(doc, filnam, FILE_NOT_FILE);
+        return status;
+    }
 
 #ifdef _WIN32
     return TY_(DocParseFileWithMappedFile)( doc, filnam );
@@ -1147,7 +1154,6 @@ int   tidyDocParseFile( TidyDocImpl* doc, ctmbstr filnam )
 
 #if PRESERVE_FILE_TIMES
     {
-        struct stat sbuf = { 0 };
         /* get last modified time */
         TidyClearMemory(&doc->filetimes, sizeof(doc->filetimes));
         if (fin && cfgBool(doc, TidyKeepFileTimes) &&
diff --git a/version.txt b/version.txt
index ca15d0a02..bd1e8442b 100644
--- a/version.txt
+++ b/version.txt
@@ -1,2 +1,2 @@
-5.7.45
-2020.11.30
+5.7.46
+2021.04.14