You can write a VBScript script to get the file version info:
VersionInfo.vbs
set args = WScript.Arguments
Set fso = CreateObject("Scripting.FileSystemObject")
WScript.Echo fso.GetFileVersion(args(0))
Wscript.Quit
You can call this from the command line like this:
cscript //nologo VersionInfo.vbs C:\Path\To\MyFile.dll