uses
System,
CRC16_ARC,
CRC32_ISOHDLC,
CRC32_JAMCRC,
PV_Ace,
PV_Arc,
PV_Arj,
PV_Bga,
PV_BH,
PV_Compressor,
PV_Gzip,
PV_Lzh,
PV_Pack,
PV_Packer,
PV_Rar,
PV_Tar,
PV_Zip,
PV_Zoo;