Worksheet Quattro Pro 1 for DOS (.wq1)
The WQ1 file extension is associated with Quattro Pro for DOS, a spreadsheet program developed by Borland and later sold by Corel. It stands for "Worksheet Quattro Pro 1" and was used in earlier versions of the software to store data in a grid of rows and columns. These files have since been replaced by WQ2 files in later versions. Quattro Pro for DOS was a competitor to Lotus 1-2-3 and Microsoft Excel, offering advanced features for its time.