Poor and unpredictable UX for adding new default app per filetype settings

Hi, as a Win11 user, I see this problem, especially troublesome if we don't have Admin access (like work PCs)
Let's say I meet a new file extension, like .mbox , find info's that os typical mail file and wish to pair it with Outlook - honestly it's my case now.

When I try to choose default App, I may get a few options, but would need luck to have the Outlook listed there.
Otherwise I need to find program by path, and not only that requires me to know it, but also if I don't have permission to view the directory (like by Admin limits when I use company device), there's nothing I could do.

Please improve this setting, maybe allow the search field on 'select default app' to provide a name, or in "Settings :: Default Apps" please add new button to add new relation 'file format to default app' - currently it provides nothing additional but viewing or modification existing correlations.

Best regards and feel free to reach me
PS screen 1 shows many things, like on terminal in upper right that the 'olk.exe' link I can see but not link to app, is a soft link to a prohibited directory. If I choose the link as default prog, I get error: The file cannot be accessed by the system".