Kotlin App Metadata File
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What is a KOTLIN_METADATA file?
A KOTLIN_METADATA file is a metadata file created while building an Android application written using Kotlin. Under certain circumstances, Android app packagers create KOTLIN_METADATA files within an app's .APK file. Most apps do not require KOTLIN_METADATA files to function, so most developers choose to exclude them from their finalized APK files.
When a developer packages a Kotlin-based app into an APK file, it is possible that the program they use to package their app will create one or more KOTLIN_METADATA files within the APK file. These KOTLIN_METADATA files, which are not necessary to an app's function unless the app uses kotlin-reflect to perform introspection at runtime, often bloat an app's file size. Thus, many developers update their app project's build.gradle file to include the following command, which prevents app packagers from creating KOTLIN_METADATA files (and other files whose extensions include .kotlin_):
APK files that contain KOTLIN_METADATA files typically store them in the kotlin and kotlinx directories.
How to open a KOTLIN_METADATA file
KOTLIN_METADATA files are not meant to be opened.