This has been an ongoing problem with Start 11. I'm currently using V1.2 beta. When trying to load ANY document from, either Start 11 Windows 7 Style or Start 11 Modern Style, I get this error message pop up briefly...
https://1drv.ms/u/s!ArpXySjqs7lJj7t2jXyNKsmFrTsIRw?e=wuyVyz
This error does not occur with either the Windows 10 Style or the Windows 11 Style and the documents open correctly in the appropriate programs.
Cheers.