Why eclipse can not find the hidden .project file until I press Ctrl-H on folder?

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http://askubuntu.com – I am using eclipse on Ubuntu 11.10 When I try to open an project in eclipse IDE, it complains that the .project file can not be found. Now if I open the project folder in Ubuntu file browser and press Ctrl-H the hidden .project file is shown. After this, moving back to eclipse I can easily open the project. I need to do this every time I login to ubuntu. (HowTos)