Macs (and other Apple devices, possibly) leave little turds in the file system (.DS_STORE, etc). They are little metadata files for Apple devices only, but are also not critical files for Apple so are entirely safe to delete. They are completely useless for Windows or Linux. Get rid of them with this PowerShell one-liner.
Get-ChildItem .DS_STORE,__MACOSX -Recurse | Remove-Item -Force -Recurse