Hi Johannes and Christine,
  This question has come up a few times recently, so it's clearly
important to some users. I'd suggest as a temporary workaround to
convert to ms2 and from that to convert to spectrumrecords, since both
those conversions seem to work. (Please report whether this two-step
process works for your data.) Bear in mind, Tide is still a
demonstration-stage piece of software, and I did not focus much effort
on data-format conversion. If you find a good workaround, please let
me know. I will allow arbitrary-naming of spectra in a future Tide
release, which should interact better with proteowizard and the
various spectrum file formats.

Regards,
Benjamin