I just upgraded one of my test sistem to webmin 1.794, when I try to use the html file manager this error are showed :
HTTP/1.0 500 Perl execution failed Server: MiniServ/1.794 Date: Thu, 5 May 2016 13:03:41 GMT Content-type: text/html; Charset=iso-8859-1 Connection: close
Error - Perl execution failed
Undefined subroutine &filemin::mimetype called at /usr/share/webmin/filemin/index.cgi line 39.
This will be fixed in the next Webmin release.