To answer these questions, I wrote the IconSizes application. I just learned from this: http://www.coreldraw.com/en/pages/ico-file/ how I can edit those Window icons, but I was interested in reading more before I start editing, and this guide is very helpful! I am not sure what happens in Windows 7 but in Windows 10 you can use scaling within the display controls to make icons and text larger on 4k and higher displays. While working on a Windows application recently, the question arose as to what size icons should be included with the application. But, within the User account all other file icons (Office 2010, various 3rd party programs) seem to be ‘full-size’ and appear the same logged on as Administrator. It is simply a standard Windows adopted a long time ago. For example, the 30x30 and 48x48 icon images are: Windows uses application icons in a variety of situations: Within Windows explorer, different icons may be required depending on the view mode: The icon sizes used by Windows in these situations at the standard resolutions are as follows. However, you can change the size to smaller or larger as per your preference. However, you can change the size to smaller or larger as per your preference. This is in some way brought about by the flexibility of the ICO format and its ability to ‘contain’ many image sizes and colour depths but is also not helped by Microsoft’s own quite poor documentation on Windows Icon Size, see here. Vista/7/8 do that for you for 256×256 icons. I think it’s rather nice how polite people have been on my blog. PE27 5RL Only use the larger size when you have visual problem to read the captions. https://photos.google.com/share/AF1QipN9hVntnDexdzGEXS3PRWSWjM_d1CihlaaEUyinLTxzfbKoIyuOj8oSTkwl3Pj-2A/photo/AF1QipO-x2C6FXjV89VybpP6NJJYL0jK2rnqjlxuVpa2?key=Y0NOcEZlYTNBODg2WGtiakVaemJTUHRRX2hoM293. So Windows itself is using 16×16 bitmap images for icons. This guide is very specifically about the icon size requirements for Windows 7 Compliant ICO files. Resize Desktop Icons Using Scroll Wheel. Windows should then use that size if the environment it is in requests it. thanks for this great info. A windows application should include the standard icon sizes 16, 32, 48 and 256. You could try one folder with a 256 and one with 512, if you can’t see a noticeable difference in image quality then it doesn’t matter either way and you should stay with 256. But I also wondered about the icon sizes used at different DPI Settings. Assuming this only happens with a specific icon? Though I really don't think this is worth the effort. I have some interest in the overlay portion for icons for an app, the problem is that some of these overlays are bound to the notification tray so end up creating icons with the overlay included because documentation is nonsense and trying to make it work is easier and faster including overlays. Windows Icon Size Guide (Win 7 ICO Format), https://plus.google.com/photos/110827855872696691083/albums/5901616909407620497/5929779829815032098?banner=pwa&authkey=CPC_q_fY-5qFxAE&pid=5929779829815032098&oid=110827855872696691083, https://msdn.microsoft.com/en-us/library/aa315378%28v=vs.60%29.aspx, https://msdn.microsoft.com/en-us/library/bb983125.aspx, http://www.coreldraw.com/en/pages/ico-file/, Why Fireworks Rocks for Rendering Crisp Icons, 256 x 256 pixels  – 32bit (24bit colour, 8bit transparency), 48 x 48 pixels  – 32bit (24bit colour, 8bit transparency), 32 x 32 pixels  – 32bit (24bit colour, 8bit transparency), 16 x 16 pixels  – 32bit (24bit colour, 8bit transparency). You seems so nice, all of you. 1 Tannery Mews, The ICO file format is an image file format for computer icons in Microsoft Windows.ICO files contain one or more small images at multiple sizes and color depths, such that they may be scaled appropriately. In ubuntu (unity) it seems to be 24x24 px. Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages. I have tried removal/re-install of the program and of the file type to no avail. Overlay icons for 256×256 size must not be in the lower left corner of the icon, and must not be already smaller to perfectly ‘overlay’ the bigger sized icon.

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