The BIGFILE option speeds up processing on large files.
Caution: the input and output files must be different if you use this option.
Use the "-b" option in the commands
SIGNXML,
VERIFYSIG,
FORMDIGEST and
MAKESIG.
Use the SAT_FILE_BIGFILE option in the VB6/C functions
Use the SignOptions.BigFile option in the .NET method
Sat.SignXmlEx.