If using command mode with Windows PowerShell, only first/last x lines can be monitored by logmon probe.
Unlike UNIX/Linux, Windows does not have head/tail commands. However, PowerShell has the equivalent "Get-Content" cmdlet. User can use the cmdlet for printing first/last x lines on Windows.
Any UIM and logmon version
Instructions:
Here is the example procedure.
rem Wrapping powershell script in batch file
@powershell -NoProfile -ExecutionPolicy Unrestricted "$s=[scriptblock]::create((gc \"%~f0\"|?{$_.readcount -gt 1})-join\"\");&$s" %*&goto:eof
rem Printing first x lines on monitored log file
(Get-Content <Monitored log file name>)[0..x]