Thank you for sharing the file. When you add a file to the grid, it has to do some reading on the file to determine the score type.
In the case of the file you've provided, it will eventually load the score but it takes a while unfortunately. I will fix this performance issue for the next version.
In the meantime, you may build libraries with BlibBuild/BlibFilter (https://skyline.ms/project/home/software/BiblioSpec/begin.view) directly from the command line to avoid waiting. The BlibBuild/BlibFilter executables are located in the same location as the Skyline-daily executable (see https://skyline.ms/wiki/home/software/Skyline/page.view?name=tip_recover_install on locating it, or you can right-click Skyline in the Task Manager and select "Open file location").