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Desktop apps
Outline
Minicons
warning, Alert, Dialog
Black
512x512
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Smooth
Farm-fresh
Toxic, danger
DarkGray
32x32
Glyph
16x16 Free Toolbar Icons
problem, warn, danger
Gold
16x16
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3D
Free Applications Icons
Message, Attention, exclamation
OrangeRed
24x24
Alert, exclamation, General
Tomato
Alert, hanger, warning
danger, Message, Attention
Goldenrod