Are you sure you selected the "Property" table on the right? Did you scroll down all the way on the left? It should be the last property in the list. If you still can't find it, type CTRL-F in Orca and search for "VS_NAMESPACE". If Orca doesn't find anything then the msi you're editing is not a Windows Embedded CE 5.0/6.0 SDK.
Re: Hi Michel: I'm trying to edit
Are you sure you selected the "Property" table on the right? Did you scroll down all the way on the left? It should be the last property in the list. If you still can't find it, type CTRL-F in Orca and search for "VS_NAMESPACE". If Orca doesn't find anything then the msi you're editing is not a Windows Embedded CE 5.0/6.0 SDK.