A quick search on Google gave me this passage in Wikipedia:
Version history
Works for MS-DOS
Microsoft Works 1.05
Microsoft Works 1.12
Microsoft Works 2.0 and 2.00a
Microsoft Works 3.0, 3.0a and 3.0b
Works for Mac OS
Microsoft Works 1.0
Microsoft Works 2.0
Microsoft Works 3.0
Microsoft Works 4.0
Works for Microsoft Windows
Microsoft Works 2.0 and 2.0a (Windows 3.x)
Microsoft Works 3.0, 3.0a and 3.0b (Windows 3.x)
Microsoft Works 4.0, 4.0a, 4.5 and 4.5a (Windows 95)
Microsoft Works 2000 (v.5) (Microsoft Works Suite 2000)
Microsoft Works 6.0 (Microsoft Works Suite 2001 and 2002) - Last version for Windows 95
Microsoft Works 7.0 (Microsoft Works Suite 2003 and 2004) - Last version for Windows 98 (Original release)
Microsoft Works 8.0 (Microsoft Works Suite 2005) - Last version for Windows 98 SE/Me/2000 - Fully compatible with Windows XP, Windows Vista, and Windows 7
Microsoft Works 8.5 (Free update for Works 8.0 and Microsoft Works Suite 2006 users)
Microsoft Works 9.0 (Microsoft Works Plus 2008) - First version fully compatible with all versions of Windows Vista
How could the version being sold be for Windows?