The server doesn't identify its version in the header so that's no help. FTP management options are available in IIS (7) Manager and there is no IIS6 Manager installed so I'm assuming it's 7.0 or 7.5 but I can't find any way to check this.
Ftp – How to determine what version of Microsoft FTP Service is running on Server 2008
ftpiis-7windows-server-2008
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Best Answer
Since FTP Server runs within svchost.exe I found that it can be determined by checking the version of the following DLL:
C:\Windows\System32\inetsrv\ftpsvc.dll
Mine showed "File version 7.5.7600.14294"