filecrc TdcFileCRC component
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The dcFileCRC component calculates a CRC (Cyclic Redundency Check) for any files. Supports three methods of checking: CRC32 (most frequently used method, used in such programs like ZIP, RAR, ARJ etc), CRC16 (applicable to XModem protocol), CRCArc (used by SEA's "ARC" utility).  

How to use ?
Just specify the FileName and checking Method and read the result from the CRC property. This works even at design-time and can calculate the CRC from the opened file.