Rename the file org.openl.rules.ruleservice.ws.storelogdata.hive-5.26.11-javadoc.jar to org.openl.rules.ruleservice.ws.storelogdata.hive-5.26.11-javadoc.zip
Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder org.openl.rules.ruleservice.ws.storelogdata.hive-5.26.11-javadoc
Double click index.html will open the index page on your default web browser.