.ICO File Format
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| File Description | ICO files contain the icons for Windows programs, files, and folders. An icon file has two color masks: the opacity mask (AND mask) determines what part of the icon is transparent; the color mask (XOR mask) contains the icon which is mapped onto the mask. Many programs could help you customize a personalized icon file. The "favicon.ico" file is special icon file. It is used to store a website logo that appears to the left of the web address in the address bar of a browser. To make favicon.ico appear, it must be 16x16 in resolution and plasced in the root directory of the website. An ICO file is similar to a Windows cursor (.CUR) file. The only differences are the bytes used to identify them and the addition of a hotspot in the CUR format header. |
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| How to Open .ICO Files |
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| ICO Programs | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ICO Topics | File Extensions ICO Frequently Asked Questions None. |
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| Related Books | The Digital Photography Book | The Absolute Beginner's Guide to Taking Photos |
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| Source |  - Official File Extension Library | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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When you double click ICO files on computer, the associated program will be launched to open the selected ICO file. But you can change it to any program at your pleasure. a) Select a program to open ICO files on WindowsRight-click on the ICO file and go through 'Open with' > 'Choose default program'. In the pop-up windows, choose a program as the ICO file opener. If you decide to always open ICO files with the program, only check the option 'Always use the selected program to open this kind of file'.
b) Select another application to open ICO files on MacFirst Get Info about any one of ICO files by right-clicking or Command-I, and click 'Open with' arrow to choose a program to start your ICO file. Click 'Change All' button to set the selected application as the default ICO file opener app.
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How to select a program to open ICO files?
