.jar file associations and Windows 7
Has your .jar associations ever been hijacked ?
Mine too, after spending far too long following suggestions of people on forums of how to get it back, using your command prompt ‘assoc’ & ‘ftype’ commands and manually editing your regedit etc…
Forget it, grab yourself this handy util ‘jarfix‘
Jarfix has existed since 2002, so can be trusted to correct the .jar association & put back the following -jar flag, so when you launch a .jar file it runs correctly. On typing ‘ftype jarfile’ in your Command Prompt you should see the following.
jarfile=”C:\Program Files (x86)\Java\jre6\bin\javaw.exe” -jar “%1” %*
Not so many... 
This is what I get errrr…..
C:\Program Files\Java\jdk1.6.0_31\jre\bin>javaw.exe” -jar %1″ %*
‘javaw.exe” -jar %1″‘ is not recognized as an internal or external command,
operable program or batch file.
Try running Jarfix.exe again.
I’ve just re-ran it on my machine and its still working.
I’ve fixed the download link as it had expired – try getting jarfix from the new link above.