This is a feature request to be able to add a list of files to be ignored on build time.
Let me quote the helpdesk ticket asking for this:
There are certain files that exist in my project that I would like to always ignore when building the application. Occasionally I will use winmerge and it will generate a backup file or occasionally temp files remain in my resources folder.
Because of this I have to go through and clean the folder of files I don't want included when the application is built. It would be nice if within the tiapp.xml file there could be a section like: