How come I can't copy sprites in ART format?

[Qsmash]

When I go to "save picture as" and save it, a blank picture comes up. I think it's becuase my computer dosen't support the format. Anyway is there any way I can fix it? I can start a good game without good sprites.

[Rule-Buster]

waht file did u save it as?

[Qsmash]

A name was already there so I just saved it.

[Rule-Buster]

try .png

[Qsmash]

It won't let me change it to png just bmp and that makes it worse.

[Rule-Buster]

that is very strange. i dunno...