Sorry, but no for two reasons.
First, .spk files are a secured format that we tried out over a decade ago. The guy who made it (
@SX) also ran the forum we used back then, but he quit keeping it up with engine developments and eventually lost the source code. In short, the extraction tool doesn't exist.
Second, you not opening the .spk is the whole point. I personally didn't agree with locking NightSlashers X, and if we ever do have such a tool again I will not use it on anything that isn't 100% original moving forward. However, at the time it wasn't my decision and to extract the module now would be a breech of trust. So it's grandfathered in.
DC