I thought the file used to create the .svf needs to be an exact hash match with the file later used for extraction. It seems not. Looks like smv is able to cope if the hash difference is caused by something minor like file creation date, or time stamps. It extracts the new file fine, though it does give an error message at the end. Might not be news to you, but it surprised me. Is anybody able to confirm that, in case it is a freak result here.