Hmm, good question.
From in RoboHelp, Help menu, Contents & Index, I get a CHM Help "Using Adobe RoboHelp HTML8".
It's in the Projects chapter, Create and open projects / Open a project / Before opening a project.
[copy and paste ...]
Before opening a project
RoboHelp uses the same folder structure as Windows Explorer. Earlier versions use the same structure, but present a different view of that structure.
By default, when you create a RoboHelp HTML project, the project is saved in the MyRoboHelp Projects folder.
If you open a project created with an earlier version, do one of the following:
Create standard folders based on the flat folders. Save your topics in the standard folders. All references are automatically updated for the new paths. RoboHelp can create folders using the same names and structure as the custom folders from the earlier version. All topics in the custom folders are saved in the new folders.
If you save your folders in a document management program such as Microsoft Visual SourceSafe, your project structure changes as well. In this case, back up your project before opening it in RoboHelp. Then create a SourceSafe folder based on the converted folder structure.
- Save all topics at the top level of the Project Manager. This top-level folder is called HTML Files (Topics). You can create additional folders and move your topics into them after you open the project. In essence, you save all topics in HTML Files (Topics), but the files are in your project folder. The reason is that HTML Files (Topics) is used only in RoboHelp. Create custom folders (which are treated as standard folders) and move your files into them after opening the project in RoboHelp.Note: Do not use Windows Explorer to create subfolders to add, move, or rename files. RoboHelp does not recognize these changes.
[End copy and paste]
I've just looked in the same place on the RoboHelp Help on the web (http://help.adobe.com/en_US/RoboHelp/8.0/RoboHTML/), and that subsection isn't there.
And yes, I know RoboHelp is supposed to be opening an AIR Help. After first installing TCS2 I got the AIR Help, but I then attempted to intall CS3. After some hours of IT support we discovered these weren't compatible so we removed CS3 and reinstalled TCS2, but the AIR Help has disappeared, replaced with a CHM file in RoboHelp, and nothing in FrameMaker (though there's still a link to a PDF). I've asked IT to see if they can get AIR back, but assumed that the CHM had the same content.
So, is it that the CHM Help I'm seeing is outdated and this advice should be ignored?