WP7 Black Listed Applications

Also in the registry there is an entry for a package manager (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PackageManager) with a Blacklist key inside. Blacklist contains a lot of id's. I think this is the way Microsoft intends to block the applications.
I am starting to understand the reason why they want the device so closed. Imagine if you would have access at the file system you would be able to modify the registry and remove the entries in the blacklist.
Anyway combining this mechanism with the update service gives Microsoft the power to remotely block/blacklist an application running on your device (something like Apple is doing now)

Looks like there is already the list explained:

REGEDIT4
[HKEY_LOCAL_MACHINE\Software\Microsoft\PackageManager\BlackList]
"{5B04B775-356B-4AA0-AAF8-6491FFEA5600}"=dword:0 ;Shortcut
"{5B04B775-356B-4AA0-AAF8-6491FFEA5602}"=dword:0 ;Say It
"{5B04B775-356B-4AA0-AAF8-6491FFEA5603}"=dword:0 ;Calculator
"{5B04B775-356B-4AA0-AAF8-6491FFEA5605}"=dword:0 ;~About
"{5B04B775-356B-4AA0-AAF8-6491FFEA5606}"=dword:0 ;~Date Time
"{5B04B775-356B-4AA0-AAF8-6491FFEA5607}"=dword:0 ;~Phone Lock Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5609}"=dword:0 ;Speed Type
"{5B04B775-356B-4AA0-AAF8-6491FFEA5610}"=dword:0 ;Text
"{5B04B775-356B-4AA0-AAF8-6491FFEA5611}"=dword:0 ;Call History
"{5B04B775-356B-4AA0-AAF8-6491FFEA5612}"=dword:0 ;Calendar
"{5B04B775-356B-4AA0-AAF8-6491FFEA5614}"=dword:0 ;Email
"{5B04B775-356B-4AA0-AAF8-6491FFEA5615}"=dword:0 ;People
"{5B04B775-356B-4AA0-AAF8-6491FFEA5616}"=dword:0 ;AccountsManage
"{5B04B775-356B-4AA0-AAF8-6491FFEA5617}"=dword:0 ;Word Mobile
"{5B04B775-356B-4AA0-AAF8-6491FFEA5618}"=dword:0 ;Excel Mobile
"{5B04B775-356B-4AA0-AAF8-6491FFEA5619}"=dword:0 ;PowerPoint Mobile
"{5B04B775-356B-4AA0-AAF8-6491FFEA561A}"=dword:0 ;SharePoint Mobile
"{5B04B775-356B-4AA0-AAF8-6491FFEA561B}"=dword:0 ;OneNote Mobile
"{5B04B775-356B-4AA0-AAF8-6491FFEA561C}"=dword:0 ;~Call Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA561D}"=dword:0 ;~Contacts Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA561F}"=dword:0 ;~Cell Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5620}"=dword:0 ;~Bluetooth Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5621}"=dword:0 ;~Flightmode
"{5B04B775-356B-4AA0-AAF8-6491FFEA5622}"=dword:0 ;~Office Mobile Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5623}"=dword:0 ;~Wifi Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5624}"=dword:0 ;~OBExParser
"{5B04B775-356B-4AA0-AAF8-6491FFEA5625}"=dword:0 ;~Find My Phone
"{5B04B775-356B-4AA0-AAF8-6491FFEA5626}"=dword:0 ;~Backup Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5630}"=dword:0 ;Zune
"{5B04B775-356B-4AA0-AAF8-6491FFEA5631}"=dword:0 ;Camera
"{5B04B775-356B-4AA0-AAF8-6491FFEA5632}"=dword:0 ;Pictures
"{5B04B775-356B-4AA0-AAF8-6491FFEA5633}"=dword:0 ;Marketplace
"{5B04B775-356B-4AA0-AAF8-6491FFEA5634}"=dword:0 ;Games
"{5B04B775-356B-4AA0-AAF8-6491FFEA5635}"=dword:0 ;Picture Camera CPL
"{5B04B775-356B-4AA0-AAF8-6491FFEA5640}"=dword:0 ;~Device Update Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5641}"=dword:0 ;~Location Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5642}"=dword:0 ;~Location Settings
"{5B04B775-356B-4AA0-AAF8-6491FFEA5661}"=dword:0 ;Maps
"{5B04B775-356B-4AA0-AAF8-6491FFEA5671}"=dword:0 ;Convert
"{5B04B775-356B-4AA0-AAF8-6491FFEA5672}"=dword:0 ;StartKITL
"{5687D2BD-E507-46ff-84FD-FBE296DAF170}"=dword:0 ;~brightness
"{4e466928-cdd9-438e-be16-3b2dfb18cbc9}"=dword:0 ;~sounds
"{eec1f6e1-c3b6-4da6-bbf6-0aaee694f7a1}"=dword:0 ;~about
"{3B1D7EA1-F8F2-434c-B09B-116589ED54AE}"=dword:0 ;Alarms
"{be937011-98b7-45d2-9735-6828d4c9a750}"=dword:0 ;SystemInfo
"{D76C40E0-616D-4e29-929C-B40697732696}"=dword:0 ;OfficeUrlStartToken
"{534c16be-a6d3-4560-a537-f5c9ccdb6ddc}"=dword:0 ;Microsoft Office

Maybe if we could remove those entries and rebuild the ROM image we will be able to run all the built in applications.