Explain direct file transmissions

### Description

The documentation in /fundamentals/servers/index.md states that HTTP.sys supports "direct file transmission" while Kestrel does not. It is not explained nor linked what "direct file transmissions" are within this context. I tried to find resources about this feature in the HTTP.sys documentation but it seams that it is not mentioned anywhere.

What are "direct file transmissions" and how does HTTP.sys support them?

### Page URL

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/servers/?view=aspnetcore-8.0&tabs=windows

### Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/servers/index.md

### Document ID

32a343a1-ba87-7274-e861-2ac194d5aa3d

### Article author

tdykstra