I needed to decompile a .war file and some .class files to help some non-developer colleagues figure out what was going on under the hood of a 3rd-party Java application. I had access to the .war and .class files and needed a decompiler on a windows machine.
I found Java Decompiler by Emmanuel Dupuy and used JD-GUI. It’s fantastic; it’s simple and it works. Check it out here: http://jd.benow.ca/
Hope this helps someone.