These files are created by the Finder but are invisible by default.
These files are used to save the positions of icons, the size of the window, the window's background and many more view options.
You can delete them if they are annoying you by their presence. They will be replaced as soon as you open a window.
What are .DS_Store files? I'm trying out a maint. utility that has an option to remove these files, however, i am reluctant to do so until i know what they are for. Powerbook G4, OSX 10.4.11. Thanks in advance for input.