It doesn't compile at least on linux
fpc 3.0.0 lazarus 1.4.4 svn 51570 built with fpcup.
RLXLSXFileFormat.pas(497,3) Warning: Conversion between ordinals and pointers is not portable
RLXLSXFileFormat.pas(497,23) Warning: Conversion between ordinals and pointers is not portable
RLXLSXFileFormat.pas(497,3) Error: Argument cannot be assigned to