Which type of operating system are you running? 32-bit 64-bit Skip to content DownloadManualBlogLibraryFilenamesHOSTSContactAboutMe on Twitter Why donate? According to the mDNSResponder.exe version information. MDNSResponder.exe's description is "Bonjour Service"mDNSResponder.exe is usually located in the 'C:\Program Files\Bonjour\'folder.None of the anti-virus scanners at VirusTotal reports anything malicious about mDNSResponder.exe. FeedbackBonjour and developed by Apple Computer, Inc.