Wrong Application icon in taskbar

I have a windows application(C#) that has the icon and manifest settings set in the project properties. The icon is set correctly. The problem I am having is when a user launches the application from his/her machine, and logs in, the icon is displayed correctly on the form window, but the icon that is displayed in the task bar is that of the last used application - so if I open MS word and close it, then launch my application, the icon for word is displayed for my application in the taskbar, even though the name is correct.

edit - after the user goes to the second screen, the correct icon shows up in the taskbar

I previously has this issue with 64 bit machines - the icon had 16X16 4 bit bmp and 32X32 4 bit bmp images. I created a new image 64X64, 4 bit bmp file, so the icon had 3 images, and that solved the problem with 64 bit machines.

However, the problem has come back again with Windows 2008 server- R1 -32 bit machine. Does anybody have any clue how to solve this? I am not talking about notify icons here, but the icon that shows up right next to the开发者_运维问答 application name in the taskbar. Thanks. IconQ

Hard to see how your icon could mess this up. It sounds like a corrupted icon cache. The linked article is quite outdated, ask more about this at superuser.com.

Microsoft Fixed issue with the Timing in the Shell32.dll Module.

Following Hotfix will Resolve your issue:

http://support.microsoft.com/kb/2519550/en-us

As Hans said, it could be a corrupt icon cache, though you're damn unlucky if you are getting this same problem on more than one machine with different OSes.

It's possible you have a corrupt icon file - The only way I would expect adding of a 64x64 image to have helped is if it simply meant the file was rewritten/regenerated by your editor. A good editor may help (e.g. Visual Studio has always had a truly dreadful icon designer, so if you're using that it certainly won't be helping - although it's only usually if you go beyond 4bpp that VS goes for the epic fail). Try IcoFX, it's free, really good, and will produce reliable icon files regardless of the content you ask it to add. It's also very good at scaling images to quickly generate a full complement of sizes and resolutions.

In general I'd go for better quality icons than 16-colours, and supply plenty of variants for the OS to pick from (at least 16, 32, 64 pixels square at 8bpp & 24bpp). I can't remember which century I last used a 16 colour icon in, but it certainly wasn't this one :-)

This is a issue with Windows Server 2008's Aero Theme. If you choose a classic theme it works just fine. Microsoft has the same issue with Office 2007's Outlook showing the Powerpoint Icon. See discussion in link below. So one choice is to select a Basic Theme not an Aero theme.

http://social.technet.microsoft.com/Forums/en-US/outlook/thread/89918687-66a1-4264-86b4-773bcc6ef373/