dae to x_t conversion is most likely related to export of 3D content between Collada 3D and Parasolid formats, something that might be sometimes difficult to achieve directly, because of the limited support for Parasolid formats.
There are always alternatives thought with the most common being with using alternative exchange format. Another option is to use one of the dedicated CAD/3D modeling converters that can be used to translate different 3D models between various formats.