Hi Guys, first things first, my explaination. Im making a program that can either open a folder or an individual file, encrpyt it, and save it with my programs extension, and then be reopened with a password promp. Now since its such a large thread range, il use a numbering system, and depending on what advice or help you have, use the number .

1. Encryption

I know how to encrypt, done tons of projects. What i want to know on the subject is, techniques. The calculations that all the large companys are using (ovbiously no uniques, but you get the idea).

2. Write/Read

Im also quite familiar with these functons. Im looking for and nics and tricks that might contribute to the editing of files.

3. File Extensions

This is where i need the most help. Creating a file from scratch. And how to make a file extension reconize my program. (also knowing how to "open" an extention properly.

Any help is greatly appreciated, il be giving credit to unique work, thanks,
___
Dan