How should I use .ico files in a Winforms Application?

ICO isn't quite an obsolete format, but it's close. It's still useful for your application icon, but for almost everything else, it's better to use an ImageList for each size that you need. And it's much faster to populate an ImageList from a bitmap that contains multiple images layed out in a grid.

ICO isn't quite an obsolete format, but it's close. It's still useful for your application icon, but for almost everything else, it's better to use an ImageList for each size that you need. And it's much faster to populate an ImageList from a bitmap that contains multiple images layed out in a grid.

You also want to use an Alpha channel transparency in your bitmaps to get the best result, so storing them as . PNG files in your resources is the best way to go, since PNG supports an alpha channel. ICO and GIF files support only single bit for transparency - every pixel is either fully opaque or fully transparent.An 8 bit alpha channel for transparency looks much nicer.

If you can send your artist back to the drawing board then you should do so, and have him/her do full anti-aliased images with alpha. If you can't, then I suggest that you write a small program to convert all of your icon files into bitmaps suitable for loading into ImageLists.

IcoFX (icofx. Ro) is a freeware which supports batch conversion from . Ico to .png.

The whole conversion process took me about 10s for hundreds of files – Brann Mar 9 '10 at 10:47.

Convert the images into PNG. Point. Whoever decided to use .

Ico files to start with should get talked to in private - the argument holds no ground.

Period" is more common than "Point". – Camilo Martin Dec 4 at 19:52.

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