For adding mceWeather and My Movies it will load to the main startup page when you install MCEWeather or My Movies, it will give you the option when you first install the apps.
Version 1 of mceWeather added an item in the start menu of MCE, but in version 2, there is only a link in "More Programs"?
Microsoft preserves two entries only in the start menu of MCE for applications of OEM-partners. "Normal" developers should not block these two items by adding their own items into the start menu. The third application which would try to add a link to the start menu would fail.
This is what Microsoft says in their MSDN: "Only OEMs should add applications to this category.".
However, i got so many mails asking to add this entry to the start menu, that i extended the setup in Version 3.0 to let you choose if the setup should add an entry to the start menu.
If need to add other apps to the main MCE startup page this may help
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Start Menu\{ABEDF8D5-1939-4518-A576-30E612340600}] //this is reg key, generate or find a unique GUID for your app(cut this comment from copy/paste)//
"AddIn"=""
"BackgroundColor"="RGB(42,90,174)"
"CapabilitiesRequired"=""
"Context"="start=1"
"Description"="whatever plug in"
"ThumbnailUrl"="C:\\Program Files\\my plug in whatever\\pluginimage.png"
"Run"=""
"Subtitle"="whatever"
"AppId"="{ABEDF8D5-1939-4518-A576-30E612340600}"
"ImageUrl"="C:\\Program Files\\my plug in whatever\\pluginimage.png"
"Title"="whatever plugin "
"Url"=""C:\\Program Files\\my plug in whatever\\pluginimage.htm "
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{ABEDF8D5-1939-4518-A576-30E612340600}]
"CompanyLogo"="C:\\Program Files\\my plug in whatever\\pluginimage.png"
"CompanyName"="whatever company"
"Description"="however description"
"Title"="whatever title"
Richard Miller Media Center MVP 2006