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Win 7 system file rename prompt: "The specified device name is invalid"

  
                  Not all letter combinations can be used to name folders. Some letter combinations cannot name folders, such as aux, com1, com2, prn, con, nul, and so on. These are the device names. If you use these letters, the error message for the specified device name will be invalid under win 7 system. Under the xp system, there is no prompt, but the renamed file name remains unchanged before. If you encounter such a situation, you can try to name it by changing a letter combination.
Win7 system basics
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