The HelloWorld application, as seen in the HelloWorld.mmp file, has: UID2=0x100039ce -- meaning "GUI type application, Unicode capable" UID3=0x101f6163 -- meaning "unique UID application number". I will correct this as soon as possible the page of my site (where I incorrectly stated that 100039CE is the unique UID for HelloWorld). The uidcrc.exe utilities uses also UID1=0x10000079 (but the user does not need to specify it). alf