Filename capitalization

[Vlad]

Hey guys, I was just wondering because I see that filenames and folders have varying character types, for example "ICONS" folder and inside you got names like "Ability_Ambush.blp" but what I've found out for myself is that I can put a icon named "ability_ambush.blp" and it will still work and load.

My question is why do some try and keep the filename capitalization proper while others like me just name them all lower case, does it mater? I use Windows so maybe it's not a problem, but would it not work on Mac or Linux?