Moderators Nergal Posted December 20, 2015 Moderators Share Posted December 20, 2015 As per my understanding, these files hold the msi installers' content information. They also contain the hash to compare the install of update and make sure the update recieved has the same make-up as the update sent by microsoft and pulled from multiple internet machines by default in windows 10, thus p2p as mentioned in the link you provided. Again Microsoft says anything remove from the \installer folder could/will break update and/or Windows Add/Remove Programs Please read and take seriously the following links https://support.microsoft.com/en-us/kb/2667628 http://blogs.technet.com/b/joscon/archive/2012/01/18/can-you-safely-delete-files-in-the-windir-installer-directory.aspx ADVICE FOR USING CCleaner'S REGISTRY INTEGRITY SECTION DON'T JUST CLEAN EVERYTHING THAT'S CHECKED OFF. Do your Registry Cleaning in small bits (at the very least Check-mark by Check-mark) ALWAYS BACKUP THE ENTRY, YOU NEVER KNOW WHAT YOU'LL BREAK IF YOU DON'T. CCLEANER, RECUVA, DEFRAGGLER AND SPECCY DOCUMENTATION CAN BE FOUND AT https://support.piriform.com/hc/en-us and https://www.ccleaner.com/docs Pro users file a PRIORITY SUPPORT request at https://support.piriform.com/hc/en-us/requests/new link to WINAPP2.INI explanation Link to comment Share on other sites More sharing options...
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