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The function FileUtil.findFreeFolder is used to find a folder available in the dir with a specific name, but if the folder exist it adds _1, _2 and so on. Debugging the Netbeans source code i found out that this function uses another function named FileUtil.checkFreeName the problem is on that function, in the code the FileObjects are using the function getName() and getExt(), and comparing getName() with the name passed by parameter, the exception occurs because the name passed by parameter contains dots like: Folder name: "Software Project version v1.21.a12" This problem is very easy to reproduce just create a folder with the name above and use the function findFreeFolder, but the problem actually is in the function used by this one wich is checkFreeName.