You can open HTML file as a database using these ways:
1. Opening by specifying file name (interface: ADO). Select File option and then browse for the needed file.
2. Opening through connection string (interface: ADO). Select Connection string option and write a connection string. This way is the most flexible one because it allows to specify many additional parameters in the connection string and override standard Exportizer connection behavior. But it is recommended basically for advanced users. Here are basic connection strings (more examples and details can be found in the Internet):
Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties="HTML Import;DATABASE=C:\MyData\MyHTMLFile.html";