unable to open database file

lugan2 It seems there is a Java applet converter that handles this conversion

https://www.mydigitallife.net/convert-microsoft-works-database-wdb-to-csv-or-excel-without-works-installed/

Java can be tricky these days so read the comments after the post. (for me it worked after i put : http://www.codealchemists.com in the Exception Site list (Control Panel --> Java -->Security)

If this doesn't work...i think you can use Libre Office/calc to open it.