Why your computer can't open it
Microsoft Works was the cheap office suite that came on millions of home PCs from the late 1980s until Microsoft stopped making it in 2009. Its database files end in .wdb, and nothing on a modern Windows PC, Mac, iPad or phone opens them: Excel and Access don't list the format, and Works itself won't install cleanly on current Windows.
The file isn't broken. It just needs something that still understands the format.
How to see what's inside
Drop the .wdb file on the box above, or choose it. The page reads it in your browser with libwps, the open-source Works reader that LibreOffice uses, and shows each record as a row and each field as a column.
Click "Save as CSV" to keep a copy that Excel, Numbers, LibreOffice and Google Sheets all open. Dates and numbers keep the formatting Works gave them.
What comes through and what doesn't
Every field and record comes through, including text, numbers, dates and times. Works' form layouts (the screen design you typed records into) and saved reports don't; you get the data itself, which is what matters when moving it somewhere new.
Works for Mac databases (.wdb from Works for Mac 4) open too.