diff --git a/ChangeLog b/ChangeLog
index 1812bc7e10..82017c6c2d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Nov 24 01:31:44 2005  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
+
+	* file.c (w32_io_info): CreateFile failed on Win9x if file was already
+	  opened. (FILE_SHARE_READ was needed, but actually I don't understand
+	  the flags of CreateFile well...)
+
 Wed Nov 23 23:52:35 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* numeric.c (num_div): use floor rather than rb_Integer().
diff --git a/file.c b/file.c
index ca8bdf2f90..92bbf89512 100644
--- a/file.c
+++ b/file.c
@@ -655,7 +655,8 @@ w32_io_info(VALUE *file, BY_HANDLE_FILE_INFORMATION *st)
     }
     else {
 	FilePathValue(*file);
-	f = CreateFile(StringValueCStr(*file), 0, 0, NULL, OPEN_EXISTING,
+	f = CreateFile(StringValueCStr(*file), 0,
+	               FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 	               rb_w32_iswin95() ? 0 : FILE_FLAG_BACKUP_SEMANTICS, NULL);
 	if (f == INVALID_HANDLE_VALUE) return FALSE;
     }