glTF ODF export: use mimetype to decide about file type
glTF ODF export: use mimetype to decide about file type

Change-Id: Ib1837bdc7468fb19f55a38f6875e026eea8d3b24

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core