Conversion from Parasolid format (.x_t) to CATIA formats (.catpart) should be possible, either with some CAD design / 3D modeling software or some kind of dedicated converter solution, such as CrossManager. Either way, it should be doable.
Convert Parasolid model (text) to CATIA part data.
We found 3 software records in the database related to .x_t to .catpart file format conversion.
Microsoft Windows software - convert x_t to catpart on Windows
A CAD converter with huge format support
Convert from x_t file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned x_t to catpart. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A dedicated CAD converter
A CAD visualizaton, analyzation and translating system