Lower-casing the library

[Chris Dee]

On that I agree it should be all lower case all the time as all caps is very ugly especially for extensions. Could it be possible that the 512 article is just an typo as I can't remember ever seeing all caps in official files.

If you mean

All files in the LDraw Parts Library are required to carry the .DAT extension.

then I think this is a typo, because later in the same article it uses .dat