If anyone like me is searching to read only a specific line, example only line 18 here is the code:
filename = "C:\log.log"
Set fso = CreateObject("Scripting.FileSystemObject")
Set f = fso.OpenTextFile(filename)
For i = 1 to 17
f.ReadLine
Next
strLine = f.ReadLine
Wscript.Echo strLine
f.Close