Are these scripts that your users will be executing from within RoboHelp to accomplish certaing things in the RoboHelp environment? Or are they scripts they will incorporate with their topics that will influence things in the outputs created by RoboHelp?
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Belay that question, I have discovered the answer myself.
To add scripts to the menu bar, first copy the script files to "C:\Program Files\Adobe\Adobe RoboHelp 8\RoboHTML\presets\scripts." Restart RoboHelp if it is already running otherwise start RoboHelp and select "View->Toolbars->Customize..." A new dialog will appear titled "Customize." Select the "Commands" tab and in the left-hand "Categories" pane select the "Scripts" item. The scripts you have added will appear with other commands in the right-hand "Commands:" pane. You can now "grab" one of the script names and drag it to any point on the menu bar; I have chosen to place my scripts directly under the "Tools" menu.
So long as the "Customize" dialog is open you can also "grab" items from the menu bar and drop them onto the "Customize" dialog, which will remove them from the menu bar.
Note that neither deleting scripts from the file system, nor removing them from the Script Explorer pod (which maintains scripts in a folder in each user's "Application Data\Adobe" area), will cause them to be removed from the Tools->Scripts menu; to accomplish that, the menu bar must be customized as explained above.