ImpressPages CMS root directory folders are as follow:

• install - installation directory. Don't forget to delete after installation!
• update - update directory. Don't forget to delete after installation!
• ip_cms - CMS core files
• ip_configs - modules and plugins configuration directory
• ip_libs - common libraries. All libraries are grouped by technology.
• ip_pugins - plugins directory
• ip_themes - themes directory
• audio, files, images, video - uploaded files are stored
  • tmp - for temporary saved files. Old files (more than 1 week old) are automatically deleted
  • repository - files, uploaded through TinyMCE

ImpressPages CMS root directory files are as follow:

• .htaccess - url rewrite rules
• admin.php - root back-end file 
• favicon.ico - favorite icon
• index.php - main front-end file
• ip_backend_frames.php - root back-end file 
• ip_backend_worker.php - handles back-end ajax and iframe posts 
• ip_cron.php - executes maintenance functions. Should be executed few times a day
• ip_licence.html - full license text
• robots.txt - information about sitemap and denied directories 
• sitemap.php - generates sitemap XML for web robots