The detection rule titled 'New Application in AppCompat' is designed to monitor and identify the execution of applications on Windows endpoints that are running for the first time. It focuses on entries in the Windows registry associated with the Application Compatibility Assistant, specifically tracking the path '\AppCompatFlags\Compatibility Assistant\Store\'. This rule is particularly useful in security monitoring as a new application execution could indicate either benign installation activities or potentially malicious software that has bypassed existing security controls. The rule is positioned as informational, alerting security analysts without immediate threat assumption but rather encouraging review of newly introduced applications. As the detection is based on registry modifications, it relies on normal registry tracking practices. It is essential to consider that while this rule aims to catch new application executions, there will inevitably be false positives associated with legitimate installations or newly set up systems that also trigger this rule. Stakeholders deploying it are advised to calibrate the alerting mechanisms based on their operational context and typical usage patterns.