The name of your project's index file (.HHK) is based on the name of your project. If necessary, you can rename the index file.
Open the project.
From the File menu, select Rename Project.
Edit the text in Index File Name.
Click OK. The new file name is saved in the project. For the changes to take effect, RoboHELP closes and then reopens the project.
Note: The name of the compiled HTML Help file (.CHM) is based on the project file name. If you change the project name, the .CHM file name will change the next time you compile. You can keep the old .CHM file name or assign a different one. For details, see Renaming .CHM files.