With Filestar you get 217 different skills for working productively with X Windows Dump Image .(xwd) files.
About .Xwd
Name
X Windows Dump Image
Extension
.xwd
Format
Binary
Category
Raster Image
Developer
X Window System
Description
Uncompressed bitmap image created by the X Windows System, a visual application used to manage networked client-server computers; stores a screenshot, or "screen dump," of a background or window from the application's GUI; created by the xwd client process.