http_400.htm
327 distinct file contents recorded under this name ยท 2000 Windows records
Newest 100 shown. The JSON endpoint has all 327.
This name has more records than one lookup returns; counts here are a floor, not a total.
HTML page Reference
An .htm file contains a web page in HTML. The extension is the three-letter form of .html, from systems with short extensions. A web browser reads the file and shows the page. The content is plain text with markup tags. Local documentation and help pages frequently use this extension.
A file extension is only a part of the file name. It does not give a guarantee about the format or the content of a file. But on Windows, the extension selects the program that opens the file.