If you rename with a normal right-click , you will definitely get an error, such as:
There is a file called project, and I want to name it. Project with a prefix dot. The window then gives an error, and a dialog box pops up so that "you must enter a file name." It may imply that this is a file suffix. So it's "illegal". But eclipse's engineering files must be named this way, and then be recognized when importing projects with Eclipse. That is, you must have this prefix dot. Such a naming method does not work with the CMD window can be modified with the command line, as follows:
Move project. Project
It is similar to renaming files under Linux.
Or you can open the project file for Eclipse with Notepad, because the project file is essentially the document format of the XML and then saved as a file with a prefix dot.
References
Http://stackoverflow.com/questions/5004633/how-to-manually-create-a-file-with-a-dot-prefix-in-windows-for-example-htacce
Under Windows, rename a prefix with "." Error problem with dot character's name