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How do I create my own file type, so when someone double clicks the file, it loads my application?

This requires serious planning and exact code. You need to decide what information you want your file to store, I assume you've figured that out already. Then you need to decide what information your program needs to know for using this file efficiently while running.
Next you have two options:either use an actual ASCII text file, or just use an array. The file format for the level editor of my game is comprised of ten string arrays that store the various aspects of a level for the game. The good thing about this is it makes it difficult for any joe schmoe to open your files in notepad and edit them to his liking. The bad thing about this is anybody with DarkBasic can open up your arrays and change them around that way, and using multiple arrays can give away your file structure if you want to keep that confidential.
The advantage of using a text file is that it can be encrypted by shifting ASCII character values over a few when saving, then moving them back when loading.
Another option is using memblocks, unfortunately my knowledge on them is quite limited, but in the right hands they are powerful.

Once you have your format planned and implemented in code you will have to register it with windows as a recognized file type, usually with an installation program or manually if you don't want to distribute. You also need to make sure that your program can accept files instantly when opened--unfortunately I don't know how to do that.

To "register" it with windows, you need to add a registry entry. What and where, I do not know.

To get the program to read the file, what you do, is the registry entry executes your program with the file that was doubleclicked as the Command Line switch for the exe.

To retreive this, call CL$() and it will give you the full path to the file that was double clicked. Then, you just open this file up via your application, and do whatever to it

Jess.

Register registry path:

HKEY_CLASSES_ROOT \ .extension \ extra-info

example:



That's for bmp's. The problem is, I don't have a damn clue what all does entries mean Might want to www.google.com or something

Also, adding an entry using DarkBASIC is kinda hard, because it automaticly adds HKEY_LOCAL_MACHINE.

No need to change the registry manually. The first time you double click the file in Windows, a box appears asking you to select a program from the list to associate that file type with. Browse and find you DB program, and select it to always open this file type with that program. By default, I think, the file's path and name is used as the program's switch.