Shared file for custom build steps

I use shared files (.shared) as templates for my projects. These templates normally define how to build the project (Project Configuration)

The templates wont work, until i add a line
<value type="QByteArray" key="ProjectExplorer.ProjectConfiguration.Id">

{b5a021dd-f4bb-48d6-ac8c-f844c0d2a8a2}

</value>

Question: Why do i have to add this id? The id seems unique to my system, if i add them for other users or on another platform, the load of the shared file will also fail.

Attached a shared file for qt creator 2.6 generated on linux

My suggestion would be to not give the project id, cause i cannot generate on and let QT Creator generate one?