[Wing, P4350 ROM development] Vincensio:
I already have a Kitchen called Hypercore. I have the original french wm6 in executable format, i extracted the RUU_signed.nbh, then i used NHBextract to extract the OS.nb. I put OS.nb in my kitchen to get the SYS and OEM files. Then i have a 2 web page showing what i can delete from SYS and OEM which can be find here:

http://www.techparaiso.com/windows-mobile/tutorials/232-porting-new-os-build-and-exploring-the-sys-folder-of-your-kitchen-and-scanning-the-importantun-important-packages-for-windows-phone-os and here:

http://www.techparaiso.com/windows-mobile/tutorials/233-porting-new-rom-release-and-exploring-the-oem-main-folders-of-your-kitchen-and-scanning-the-importantun-important-packages-for-windows-phone-os

i did my own .rgu with a generated UUID file for my personnal tweaks that i put in a folder i names zzz_My_registry_OEM to be sure its installed at last and the .rgu file goes like this:

REGEDIT4

;Stop the software keyboard always appearing

[HKEY_CURRENT_USER\ControlPanel\Sip]

"TurnOffAutoDeploy"=dword:1

;change the location of Temp files

[HKEY_LOCAL_MACHINE\System\FileSys]

"TempPath"="Carte de stockage\Volatile

;change the location of My Documents

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows CE Services]

"NoSubFolderIn"="\Carte de stockage\My Documents"

;change the location of emails attachements

[HKEY_LOCAL_MACHINE\System\Inbox\Settings]

"AttachPath"="\Carte de stockage\Emails\Attachements"

"PropertyPath"="\Carte de stockage\Emails"

;change the location of Temporary Internet Files

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]

"Cache"="\Carte de stockage\Temporary Internet Files"

;change the folder where the camera write its images and videos

;Images:

[HKEY_LOCAL_MACHINE\Software\HTC\Camera\Image]

"SaveFolder_040C"="\Carte de stockage\My Documents"

;Videos:

[HKEY_LOCAL_MACHINE\Software\HTC\Camera\Video]

"SaveFolder_040C"="\Carte de stockage\My Documents"

;change the rings folder location

[HKEY_CURRENT_USER\ControlPanel\SoundCategories\Ring]

"Directory"="\Storage Card\Rings"

;change the slide-out keyboard layout in US

[HKEY_CURRENT_USER\ControlPanel\Keybd]

"Locale"="0409"

;keep the .cab after installation

[HKEY_LOCAL_MACHINE\Software\apps\Microsoft Application Installer]

"nDynamicDelete"=dword:0

;show\hide clock in task bar

;(it activate the battery indicator when the clock is off)

[HKEY_LOCAL_MACHINE\Software\Microsoft\Shell]

"ShowTitleBarClock"=dword:0

So far so good. But the only 2 links i got to know what i can delete from SYS and OEM, is not enough to make a real good clean of all the apps i want. There is no tutorial no where explaining it. You tell me i should learn how to cook, but how can i learn if everytime i ask some information like i just did, the people suggest me to learn how to cook? Thats exactly what i'm trying to do here. All i want is to know, which freakin folder goes with which app and which rgu or whatever i need to modify or delete to make a clean removal. I want to learn, but i cant learn out of thin air. I also found the folder BaseApps in the SYS folder and it seem to have some apps there too, but i'm just not sure if i can just go and delete whatever i want that wear an obvious name like calendar.exe

If someone know where to refer me so i can LEARN as you said so easily, well, just tell me because thats all i'm asking to learn.