Hmm det lyder lidt underligt
Microsoft Technet har smidt en artikel op omhandlende oprettelse af nye gadgets - hele guiden er her:
http://www.microsoft.com/technet/scriptcenter/topics/vista/gadgets-pt1.mspx#E3DOBS: Du må ikke have mellemrum i dine mappenavne hvis du har det! - og mappen SKAL ende på .gadget
Dette er hvad der står omkring .gadget-mappen:
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Inside the Gadgets folder create a new folder. Give this folder any name you want, provided that the name ends with a .gadget file extension (for example, Test.gadget). Obviously it will make your life easier if the name of the folder bears some resemblance to the gadget contained within. However, the operating system merely uses this folder to identify that the files inside make up a gadget; the gadget name is derived from information found in the manifest, not from the folder name (as the Scripting Guys discovered the hard way).
All you have to do now is place all your files (such as Gadget.xml and Test.htm) in the folder. Does that mean you now have a Microsoft Gadget? You bet it does. In fact, with Windows Sidebar up and running click the + button to bring up the set of gadgets found on your computer. Your gadget will show in the gadget picker dialog box.
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Jeg håber dette løste dit problem :)