We are not aware of a possible, reliable and secure way to convert Windows Executable Files to Hypertext Markup Language Files (.exe to .html conversion).
Such a conversion might be related to many things, but certainly, you should always be super careful when handling executable from unknown sources. Your device might easily end up infected with ransomware, malware, or some other internet garbage.
In a word, direct exe to html conversion is not possible.
So don't expect any so-called exe to html converter or exe to html free online conversion tool available.