I've got my desktop set up to use a light-colored text on a dark background.

The installation program of PlayOnLinux uses my default text color, but then forces a white background, resulting in completely unreadable text.

Same bug here...

PlayOnLinux must choice the user desktop color setup or its own color setup, but actualy uses both in a wrong way.

So, let's assume I'm on KDE. How do I choose a different color scheme for GTK+ apps?

Modify .gtkrc

Thank you, I solved it by adding these lines to my ~/.gtkrc-2.0-kde4

style "user-colours"
{
fg[NORMAL]="#000000"
}
widget "*" style "user-colours"