Let us export and import to MS-Excel (*.xls) format.
(Many people don't know what a "Tabular-Text" or „Comma-Separated-File“ is.)
And while you are at it:
Added on 9.11.2007
There is actually an other stupid bug in the export dialog:
After you open the export-dialog you can actually set the "Save as type"-field which has the default value "Structured text". If you change this to "Calendar file (.ics)" and enter a file name, then it works fine and you are presented with the next dialog for iCal-Export. However if you select an existing iCal file from the file system, then the "Save As Type"-field is automatically changed to "Calendar file (.ics)", but if you now continue you are presented with the "Structured text"-dialog. (Even that it looks like that the type has been changed, it is actually not the case and you are still exporting structured texts.)