# Clarification on winlog.event\_data.paramXX Field in Windows System Application Logs

**URL:** <https://discuss.elastic.co/t/clarification-on-winlog-event-data-paramxx-field-in-windows-system-application-logs/375759>\
**Category:** Kibana\
**Tags:** windows\
**Created:** [March 12, 2025, 7:08am UTC](https://discuss.elastic.co/t/clarification-on-winlog-event-data-paramxx-field-in-windows-system-application-logs/375759 "2025-03-12T07:08:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![amarasinghe.kaluarac](https://avatars.discourse-cdn.com/v4/letter/a/97f17d/32.png) [@amarasinghe.kaluarac](https://discuss.elastic.co/u/amarasinghe.kaluarac)\
**Post date:** [March 12, 2025, 7:08am UTC](https://discuss.elastic.co/t/clarification-on-winlog-event-data-paramxx-field-in-windows-system-application-logs/375759/1 "2025-03-12T07:08:01Z")

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Hi All,

While browsing the Windows `system.application` logs, I came across the field `winlog.event_data.paramXX`. After reviewing the [Elasticsearch documentation](https://www.elastic.co/guide/en/integrations/current/system.html#system-application), I noticed that this field is mentioned as a keyword type, but there isn’t much explanation beyond that.

It appears to be some kind of variable or placeholder value that hasn’t been properly passed. Could someone clarify the purpose of these `winlog.event_data.paramXX` fields and how they should be interpreted?

Thank you for your support.