Why is the MIME configuration for .md files not automatically included?

[KevinKrueger]

Why is the MIME type configuration for .md files not included by default in the web.config of IIS, and can you configure this so that you don't have to manually adjust it every time after publishing?

[gfoidl]

not included by default in the web.config of IIS

Why it's not included in IIS I don't know (maybe when IIS was (first) made, .md files didn't exist?).
For ASP.NET Core see

aspnetcore/src/Middleware/StaticFiles/src/FileExtensionContentTypeProvider.cs

Lines 13 to 16 in d72b3c2

	// Notes:
	// - This table was initially copied from IIS and has many legacy entries we will maintain for backwards compatibility.
	// - We only plan to add new entries where we expect them to be applicable to a majority of developers such as being
	// used in the project templates.

configure this so that you don't have to manually adjust it every time after publishing

Do you mean Prevent web.config transformation?

[KevinKrueger]

I have a .md file in the wwwroot which can be called up during development and cannot be found in the IIS after publishing although it is there.

[KevinKrueger]

I have not configured anything to prevent this. I always publish from the solution.