vti bin owssvr dll or vti_bin/owssvr.dll what is this anyway?
vti_bin/owssvr.dll and vti bin owssvr dll
vti bin owssvr dll or vti_bin/owssvr.dll is a file used by Microsoft Office and Explorer whenever the "Discuss" feature on the toolbar is turned on or enabled.
If you are looking at your web pages logs and wondering what vti bin owssvr dll or vti_bin/owssvr.dll is then don't worry it's just being automatically queried. If you want you can delete the folders if they are even present.
Either way... no big risk. Its just Microsoft auto querying to see if Office Server Extensions are present.