windows环境下实现文件批量更名拷贝。某个文件下的所有文件，只截取主文件名前、中、或者后若干位为新的主文件名，另存其它文件夹。-windows environment for file batch rename copy. A file of all documents under the only interception of the main file name before, during, or after the number of bits for the new master