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It is necessary when working in a project shared by many developers to add an individual file to a project. For example, adding a 'build.xml' that is shared across IDE's. Once added, it becomes available to the CVS tools which would be useful. Further, it is necessary to be able to add a source folder but then filter out sub-folders. Consider the structure of a project that is: src /com/myco/oldversion /com/myco/newverson The source folder should be 'src' but I do not want to recognize the 'oldversion' hierarchy in my project.
Re. adding a build.xml which is shared across projects (I suppose that is what you meant?) - just use the Favorites tab. Re. oldversion package - see issue #49026. *** This issue has been marked as a duplicate of 49026 ***