[solved] hidden file

[Silverthorn]

I assume that NTSD has been packed together with a so called "Molebox" program. Keeps the files where they are, prevents unauthorized copying of some files, and prevents modding. As far as I know, the molebox program isn't for free but you might be able to download a trial version to see how it works. Google should give you some good results when you search for "molebox"