Ok, I am sorry for making a thread about something like this but I have searched to no avail on google. I am trying to find a file type that I can write text to and retrieve those values, but I need my program to be the only program able to open it. I dont care what type of file it is as long as it cant be opened with notepad, wordpad, MS Works, Word processor or anything like that. If anything can you point me to a site showing something on making my own filetype. Any help is greatly appreciated.