[2005] Deployment - Conditionally Installing a File

I have a deployment project in which I want to install a file to the Application Folder only if it doesn't already exist. I don't want to overwrite it.

I tried adding a "File Search" for the specific file in the [TARGETDIR] folder, calling the property "CHECKFILEEXISTS" and in the condition property of the file, I put: "NOT CHECKFILEEXISTS". However, when it installs, if the file exists, it doesn't just not overwrite it, it removes the one that's there!

Does anyone have any ideas?