dsl.dz.files.zip = dsl.files.zip ?

[belleyeah]

Hi all,
this is just a newbie question:
I zipped all multimedia files (jpg, wav, etc) into a file with a name dsl.dz.files.zip or dsl.files.zip and found that both file names were accepted by Goldendict.
Any differences between these 2 file names?

[Abs62]

GD search resource file in the following order: ".dsl.files.zip", ".dsl.dz.files.zip", ".DSL.FILES.ZIP", ".DSL.DZ.FILES.ZIP". And stop search if file is found.