CellTracking uses its own export format to save data such as features tagging. This format will evolve through versions, and it can happen that a new version of CellTracking cannot read a file created using an older version (forward compatibility -opening a new file with an old version of CellTracking- is really unlikely to happen).
Be aware that the specifications of the export files may change as the software evolves, and that backward compability can be broken when a new version is released. This is more likely to happen in the early stages of development. Anyway, some export features to spreadsheets software will be available, helping to save all the data from the software.
To help you to see if the version you are using is backward-compatible, please consider the following rules :
Export is active for all the functions implemented so far (channels, grid, features). Everything is saved in a single pickle file as a hierarchical dictionary.
No export option available in this versions. In version 0.7.5a10, Grid export was added. The export format is a simple pickle object.