Export/Import FEM Mesh => Bulk Data (.Dat) without the icon

HI
Anybody know how to export/Import a mesh from Analysis /Advance Meshing Tools
for eventually putting the command into a script!
Not using the icon commandor the

CATIA.StartCommand"ImportMesh"
CATIA.StartCommand"ExportMesh"

These command doesn't seem to accept any input or output for the .dat name

Can't find any information on the help of Catia
Using V5R16SP4

Thank!