Explorer (service into Windows Operational System) is identified as explorer.exe and is located into C:\WINDOWS folder. Another file, identified as explorer.exe is found into C:\WINDOWS\system32\dllcache. Both of them are 1.012 KB and those modification dates must be compatible with other install files into your Windows version.
Any other file identified in a different way or in a different folder, must be faced as infected file that can put your system in danger. Use a reliable AV, as BG is, and scan your machine using the complete verification.
In addition you can use an antimalware tool, like MalwareBytes, and scan your machine looking for possible malwares.