Duplicate :
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FULL PRODUCT VERSION : Java SE 7 update 4 developer preview ADDITIONAL OS VERSION INFORMATION : Windows 7 Ultimate Service Pack 1 64-bit A DESCRIPTION OF THE PROBLEM : This version of the program, as well as future versions (JRE8, to name one) do not set file associations for JAR files. This can be a problem if the JAR is executable. EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - The JRE should be set to open JAR files, like version 7u2. ACTUAL - No file association. REPRODUCIBILITY : This bug can be reproduced always. CUSTOMER SUBMITTED WORKAROUND : A possible workaround is to set the file association manually, but I don't know exactly what binary is used for this particular action.