What version of your data should you share, and what file format should you use?
Which version of the data would you personally find useful for a variety of future projects? Generally, the version of the data that you analyzed might be useful in other researchers' analyses, whereas raw instrument data might not be intelligible to anyone who hasn't used that instrument before.
While you often need to work with proprietary file formats during a research project, consider saving a second copy of your final data in a non-proprietary format, to ensure that you and other researchers will be able to access the data in the future.
In general, file formats are more likely to be accessible in the future if they are:
open, with documented standards
in common usage by the research community
using standard character encodings (i.e., ASCII, UTF-8)