Jacek Caban (@jacek) commented about dlls/mshtml/tests/rsrc.rc:
/* @makedep: xhr_iframe.html */ xhr_iframe.html HTML "xhr_iframe.html"
+/* @makedep: utf8_css */ +utf8_css HTML "utf8_css"
Please use proper file extensions for the added files. Note that the name shown in resources doesn't have to match the filename used to create them.
While omitting the extension may have been useful for experimentation earlier, we now know that the extensions don’t affect behavior, so there's no real benefit in leaving them out. In fact, doing so prevents us from testing with the correct MIME type, which is a much more common and relevant scenario.