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I just discovered that the laptop I use at work allows indeed to use a Jpeg or PNG image as background.I also have Active Desktop deactivated and the same OS as you, but I can use bmp, jpg, png, gif, tiff, etc. Maybe it's something else like a registry setting?
WinXP Pro SP2. Perhaps it is because Active Desktop is deactivated.
Intrigued, I investigated and found:
1) I am not the only one who though this isn't possible:
Comments refers to Active Desktop. So I searched the later and found:
Well - support for JPEG wallpapers is a new feature in Vista. In previous versions of Windows, only BMP images could be used for wallpapers.
2) Indeed, Active Desktop is necessary for this display.
That's for Windows 2000, but it lead to the right path.
You can enable Active Desktop using a policy
The laptop as no special registry at HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer while my main computer, where I found myself unable to set a Jpeg background (although the file chooser shows the option!), has the key:
I am not too sure how I have setup this (perhaps with TweakUI, I see other options from there), but I keep this setting... ;-) I changed the value to 0 for testing, and indeed I could set a Jpeg image manually.
Just to clarify a minor but puzzling issue... :-)
Oh, while searching, I found an interesting link leading to a 404 page. ;-)
But I found the new right page: http://www.k10k.net/pixelpatterns/
It shows a good deal of small images designed to tile (mosaic) on Web page or desktop background. These images are user submitted, this ensure a wide variety of patterns!
I remember there used to be a site offering something similar, except you could even design the pattern online, with a Flash application. I wonder if this site still exists. I can't remember its name.
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