I have the task of updating a paradox program consisting of several forms and tables. It is currently in Paradox 5 and I need to updated it to Paradox 10. I have been informed that all I need to do is open the .fsl and deliver it. My problem I am running in to is that some of the .fsls cannot be viewed in design view and I can't find a way to deliver them. Is there some security or something that is stopping me from opening them in design view?

What actually happens when you say "cannot be viewed in design view"?
Does Paradox issue a message or are you trying to open a .fdl file? If it is a .fdl, it is not the source, it is the delivered result. If you cannot find the .fsl file, you have a real problem.

Any Paradox-5 FSL file should be openable in Paradox-10. The question then is, exactly what happens when you try?

(FDL files can't be opened.)