これを試して
Option Explicit
Const FILE = "output.txt"
Dim fso
Dim ts,line
Dim match,matches
Dim os,mem
Set fso = CreateObject("Scripting.FilesystemObject")
Set ts = fso.OpenTextFile(FILE)
With New RegExp
.IgnoreCase = True
While Not ts.AtEndOfStream
line = ts.ReadLine
.Pattern = "[a-z]+"
Set matches = .Execute(line)
For Each match In matches
os = match.Value
Next
.Pattern = "\d+"
Set matches = .Execute(line)
For Each match In matches
mem = (CDbl(match.Value) / 1024)
Next
WScript.Echo os & vbTab & mem
Wend
End With
Set ts = Nothing
Set fso = Nothing
WScript.Quit