The directory structure of the created web map is the following: (when using one theme)

the “web” directory:
The web folder contains all the files which
have to be uploaded to the FTP server in order to publish your project.
The most important file in this folder is “index.html”. Double-click on
this file to open your project in the browser. All other files are accessed
automatically.
By means of the folder numeration, different themes are distinguished, “lists_0” designating the first theme, “lists_1” the second theme, and so on.
Hint: Do not, by any means, make any changes in the directory structure.
The directory "web” contains the following subfolders:
The folder “gis” is only created if you have activated the option “Create tiles only” or “Create web project and tiles” under the index tab “Output”. This folder contains all the tiles and world files which can be used independently from the HTML project.