je toho plnej web, aneb pan google poradi:

This graphic is named OEMLOGO.BMP and is stored in your computer's system folder (usually C:\WINDOWS\SYSTEM). It has a maximum width of 180 pixels and a maximum height of 114 pixels, with the colour of the second pixel from the left on the bottom row of pixels becoming transparent throughout the image if it is saved in 8 bit/256 colour mode. A 24 bit image with potentially millions of colours will work, but cannot use transparency.
aneb udelej to jako 256barevny (8bitovy) bmp, a barva druheho pixelu zleva, ve spodnim radku, je pruhledna. A samozrejme max rozmery 180x114. (SxV)