The Legacy_FSControl49Support module, aka FakeFreeSpace, originally written by Justin Fletcher and containing modifications suggested by David Ruck. It is designed to get around software that uses the 32 bit free space call (eg Navaho) and so has problems on drives of more than 2Gb. Not Iyonix compatible.
If the program still has even a chance of being modified by the original author, complain to them. Otherwise, use this patch.
To recompile the module from the source (included) you’ll need JFShared and JFPatch, both used to be available from Justin Fletcher’s software page. JFShared available from Drobe's file archives.