Add in the Explorer s right-click menu "CRC32 value for this file" menu item, when elected in this menu displays CRC32 value of the document can be used to quickly compare two files are identical (if two files are identical, their CRC32 is certainly the same, but not vice versa, but the probability is very small. available for a rough comparison, the benefit is more than easy to directly compare two files, and fast.)

calccrc32.dpr
CRC.pas

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