@RandallWilliams thank you for the list of file name extensions and all your help so far. Unfortunately adding your list of allowed file types did not resolve my problem where GIS services (e.g. map, feature, etc.) are not working with "allow unlisted file name extensions" disabled in IIS.
I think it's because many of the requests to a GIS service don't really have a file extension. Here is an example:
https://gisweb.columbus.gov/arctest/rest/info?f=json
Does anyone know if "extensionless" requests like that are blocked when unlisted file types are disallowed? If so, is there a solution?
I've seen suggestions online to include a wildcard ("*") as one of the allowed file types, but to me that would defeat the purpose of disabling the setting in the first place.