Merge bk-internal.mysql.com:/home/bk/mysql-5.1-engines

into  chilla.local:/home/mydev/mysql-5.1-bug26782

storage/myisam/mi_create.c

@@ -603,10 +603,12 @@ int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs,
   }
   else
   {
+    char *iext= strrchr(name, '.');
+    int have_iext= iext && !strcmp(iext, MI_NAME_IEXT);
     fn_format(filename, name, "", MI_NAME_IEXT,
-              (MY_UNPACK_FILENAME |
-               (flags & HA_DONT_TOUCH_DATA) ? MY_RETURN_REAL_PATH : 0) |
-                MY_APPEND_EXT);
+              MY_UNPACK_FILENAME |
+              ((flags & HA_DONT_TOUCH_DATA) ? MY_RETURN_REAL_PATH : 0) |
+              (have_iext ? MY_REPLACE_EXT : MY_APPEND_EXT));
     linkname_ptr=0;
     /* Replace the current file */
     create_flag=MY_DELETE_OLD;