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Desktop apps
Pixel
Splashyfish
osx, warning, Application
WhiteSmoke
16x16
windows, Application, warning
warning, Box, weight
Khaki
warning, A4, document
Snow
warning, document, Letter
warning, documents
Silver
Error, Attention, exclamation
Red
warning
Orange
triangle, Attention, warning
notice, Alert, triangle
Black
Circular
Alert, exclamation, warning
Gold