Where are FME coordinate definitions stored

From Fmepedia

Q) Where are FME coordinate definitions stored?

A) Not, as you might think, in LocalCoordSysDefs.fme - that file only contains overrides to the base set of systems.

Coordinate system defintions are actually stored in a binary format in the file <fme installation dir>/Reproject/Coordsys (Coordsys is the name of the file - there is no extension).

The parameters for datums are likewise stored in <fme installation dir>/Reproject/Datums and ellipsoid information in <fme installation dir>/Reproject/Elipsoid

Because the definitions are stored in a binary format a user should not expect to be able to edit them here, but could override them with an entry in LocalCoordSysDefs.fme or, preferably, in MyCoordSysDefs.fme.