cyberdemon, удалите разделы реестра (если есть):
- HKEY_CURRENT_USER\Software\Classes\.htm
- HKEY_CURRENT_USER\Software\Classes\.html
- HKEY_CURRENT_USER\Software\Classes\.mht
- HKEY_CURRENT_USER\Software\Classes\.mhtml
- HKEY_CURRENT_USER\Software\Classes\.shtml
- HKEY_CURRENT_USER\Software\Classes\.xht
- HKEY_CURRENT_USER\Software\Classes\.xhtml
- HKEY_CURRENT_USER\Software\Classes\ftp
- HKEY_CURRENT_USER\Software\Classes\http
- HKEY_CURRENT_USER\Software\Classes\https
- HKEY_CURRENT_USER\Software\Classes\htmlfile
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.htm
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.html
