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Event Type:    Information
Event Source:    MyAppName
Event Category:    None
...
Computer:    COMPUTER-NAME
Description:
The description for Event ID ( 0 ) in Source ( MyAppName ) cannot be f
+ound. The local computer may not have the necessary registry informat
+ion or message DLL files to display messages from a remote computer. 
+You may be able to use the /AUXSOURCE= flag to retrieve this descript
+ion; see Help and Support for details. The following information is p
+art of the event: This is a test log entry..

use Win32::EventLog;

...
  EventType => EVENTLOG_INFORMATION_TYPE,
  Strings => qq(This is a test log entry.),
});

MessageIdTypedef=WORD
LanguageNames=(English=0x409:MSG00409)

...
Language=English
%1
.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Applica
+tion\MyAppName]
"TypesSupported"=dword:00000007
"CustomSource"=dword:00000001
"EventMessageFile"="C:\\the-location-that-your-eventlog.dll-will-be-in
+stalled\\EventLog.dll"

use Win32::EventLog;

my $eventLog = Win32::EventLog->new('MyAppName');
...
});

$eventLog->Close();