How do modify this script to backup something other than the applications event log?

I have the code below that backs up the applications event log, but instead of the applications event log I need it to back up a particular log file in the applications and services log (applications and service > softwarecompanyA).

How do I modify the code below to do it?

dtmThisDay = Day(Date)
dtmThisMonth = Month(Date)
dtmThisYear = Year(Date)
strBackupName = dtmThisYear & "_" & dtmThisMonth & "_" & dtmThisDay

strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
    & "{impersonationLevel=impersonate,(Backup)}!\\" & _
        strComputer & "\root\cimv2")

Set colLogFiles = objWMIService.ExecQuery _
    ("Select * from Win32_NTEventLogFile where LogFileName='Application'")

For Each objLogfile in colLogFiles
    objLogFile.BackupEventLog("c:\scripts\" & strBackupName & _
        "_application.evt")
Next