This means that if you create an installer, that installs your application to C:/Program Files, where non-admin users will not have write permission, then you cannot create tool storage files.

I'm using an MITK derived from 2015.05.2, but its still present in master today.

I also mentioned previouslt:
https://github.com/MITK/MITK/blob/master/Modules/IGT/IO/mitkNavigationToolStorageSerializer.cpp#L37

and this commit:
https://phabricator.mitk.org/rMITK24a5dd89fb30d4a5ab22c1c42cfb1b283cbd3f00

but I don't know why these commits are not available on MITK master.

Thanks