I'm using Lparameters in the main procedure of my DataInstall app. When using the windows Run command I can run it by typing c:\datainstall.exe "c:\program files". This works fine. The problem occurs when it is called this way: c:\datainstall.exe 'c:\program files' (Using ' instead of "). An error message says 'Must specify additional parameters'. I'm fine with using " instead of ' but the application that launches it (InstallShield) uses '. How can I get this to work?