我不确定这是否使它成为Windows 8.1 Update的新发布预览版，但是有传言称该文件是否为"Assigned Access"的成为Windows应用商店应用程序的新功能

I´m not sure whether or not this made it into the newly released preview of the Windows 8.1 Update, but check for "Assigned Access" it was rumored to be a new feature especially for Windows store apps

请参阅官方8.1产品指南此处，其中仅提及它两次，但是也许值得安装预览.

See the offical 8.1 product guide here, it only mentions it two times but maybe it is worth installing the preview.