Description
bool 
px_open_fp ( resource pxdoc, resource file )
   Open an existing paradox database file. The actual file has to be opened
   before with fopen(). This function can also be used to
   open primary index files and tread them like a paradox database. This is
   supported for those who would like to investigate a primary index. It
   cannot be used to accelerate access to a database file.