When using the Spectrum analyzer “Maximum” FFT option, the data saved using “Save FFT Data” does not match the data displayed on the screen. It seems to be the data from a single frequency.
I thought the help document indicated this would save the frequency and amplitude data of the Bode plot as is displayed in the application.
Sorry about the inaccurate help document. Indeed, in maximum mode only the last captured trace data is saved to file.
The problem is fixed.
The screen is saved to the text file correctly now.
You can download the modified files from this link: box.net/shared/egzeb3k08t
Just extract the files to the PcLab2000SE folder (C:\Program Files\Velleman\PcLab2000SE) and run the PcLab2000SE program normally.
Here an example data in an Excel chart:
It does appear I can collect the data using the DSOLink.dll. 
Oops, missed your second reply. Thanks for the update.
OK.
Please test. Hope it works fine now…
A quick test indicates the changed program now functions correctly. Very nice.
It’s nice to read that the fix seems to work!