What is a Windows Vista Icon

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What is a Windows Vista icon?

August 15th 2005, updated on September 8th 2005

This article pinpoints the differences between Windows Vista icons and Windows XP icons and explains how did Microsoft extend the .ICO file format.

This article is based on observations made while working with Windows Vista and Windows 7. There is no difference between Vista and Win7 icons from the technical point of view.

To understand this article you should already be familiar with Windows XP icon format.

Windows Vista Explorer

Explorer in Windows Vista has a new ability - it can zoom the displayed items in and out. The zoom factor is set using a slider (on the panel in upper left corner) and it is continuous.

Explorer makes use of high-resolution 256x256 icons if they are available. The following screenshot of Windows Explorer shows, that Microsoft already created high-resolution version of several icons (Folder, My Computer, Network, and more...). This ability is not limited to system icons as demonstrated by a custom 'example-vista-icon' in the lower row.

Windows Vista Explorer screenshot
Slider on the panel in left upper corner controls zoom factor.

Icon format changes in Vista

The ability to put 256x256 image inside an icon is not new. It was possible in XP and even in previous systems. The problem is that an icon with all 12 formats would occupy more than 400kB on disk. This is considerably more than a ~25kB for a complete Windows XP icon. This problem was solved by extending the icon format.

The breaking change in Vista icons is that images in icon may be stored as PNGs. With PNG compression, the size of an icon is reduced and because PNG is loss-less and supports 8bit alpha channel, the quality of icon is not lowered.

32bit images from Windows Vista folder icon
Truecolor versions of default folder icon from Vista.
The icon contains 12 formats: 16x16, 32x32, 48x48 and 256x256 pixels, all in 16M, 256 and 16 colors.
Large versions are compressed in Vista.

Only the large images are compressed in current Vista icons. Our experiments show, that Vista will gladly accept an icon with all images compressed, but this icon would be unreadable in Windows XP or previous.

For our experiments, I have prepared an icon that mimics the format of Vista icons. That is, it has 12 images ranging from 16x16 to 256x256 pixels in all color depths. Large images are compressed. You may download this icon from the icon gallery.

Editing Vista icons

At the time of writing this article, none of the major icon editors understands Vista icon format. This is no surprise as the format differs considerably.

We have prepared a special edition of RealWorld Icon Editor that fully supports Vista icons. This world-first Vista icon editor can open, extract, modify and save Vista icons. It is also possible to save the icons without compression for full compatibility with Windows XP.

Recent comments

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user icon Nibbler registered user on November 17th 2015

Windows 8 at school!

user icon Anonymous on December 24th 2015

Windows Bact ;-) без резльтаут секунд!

user icon beelee registered user on January 8th

spaceman yu are da best I love yu

user icon beelee registered user on January 22nd

:-D plz take me

user icon destiny registered user on February 4th

:-( im confused

user icon Anonymous on September 7th

Windows seven home

user icon Anonymous on September 15th

GOODDĐ

user icon Anonymous on September 29th

vista is very confused with the windows bcuz anyone hav a vista in our time

user icon andi anto registered user on November 5th

good

user icon Anonymous on November 9th

It is like a ship without rudder

user icon Anonymous
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