We do not know about any 3rd party converter that could convert .lwd files from LotusWorks to another format used by Lotus, .fm3 spreadsheets. However, it should still be possible in the original Lotus 1-2-3 software, so that will be your best chance for lwd to fm3 conversion.
Convert LotusWorks text document to Lotus 1-2-3 release 3.x spreadshee.
We found one software available in the database for this conversion.
Microsoft Windows software - convert lwd to fm3 on Windows
Old spreadsheet program from IBM
Convert from lwd file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.