I'd like to be able to examine the contents of a JAR file without having to install Winzip or some other tool and without having to rename the file. Windows Explorer can open ZIP files just fine; is there some registry setting I can use to let it treat JARs like ZIPs?
Or from the command line:
Under Vista (or higher) you have to run this in an elevated Command Prompt.
I tried exporting HKEY_CLASSES_ROOT\.zip, changing all references of '.zip' to '.jar' and importing it to HKEY_CLASSES_ROOT\.jar.
Under Vista at least it let me open a .jar file as if it were a .zip.
What you need to do is associate the JAR extension in Windows Explorer with Compressed folders. From Windows Explorer select tools / Folder Options. Then the Files Types tab. Select New and associate JAR Compressed (ZIP) Folder.
The HKEY_CLASSES_ROOT trick doesnt work under Windows 7. There mut be some compelling reason that MSFT doesnt want us to do this.