HanDBase is a popular and powerful database program supporting an impressive number of PDA and smarthphone platforms, among them Symbian. The program started on the Palm platform quite a number of years ago. You find information about that product here.
Because of the wide use and long market presence there are a lot of databases in the HanDBase format around. You can find a large collection of around 2000 databases on the producer's website here. The MemoWare also offers quite a number of HanDBase files.
MoStacks imports the majority of files that were written by HanDBase, starting at files written by version 2.7 of that product (the latest version as of fall 2008 is 4, which is supported.) An import of such a file always results in a new stack; importing into an existing stack is not supported.
The import is not perfect, but works most of the time, and if it works, you can be reasonably sure that all data records found their way into the MoStack. However, treat this as a disclaimer, and if the data is really critical, don't rely just on this importer.
There are some HanDBase field types that MoStacks does not support. The corresponding fields will be there, but with a text value of **unsupported** instead of a proper value.
Also note that HanDBase files have no unique extension that can be used to reliably recognize them just by their name. They use the usual .pdb extension for Palm database files, written by various products in formats that only have some fundamental similarities, formats that MoStacks does not support.
On the MemoWare website, and even on the DDH Software website, there are a number of files labeled as HanDBase files which are in fact files of other formats. If MoStacks rejects a .pdb file, such an unsupported format is more likely than a problem or bug in MoStacks HanDBase importer.