.kt

Low risk

Kotlin source code

JetBrains' JVM language. Google's preferred language for Android and a more concise alternative to Java on the JVM.

MIME types

text/x-kotlin

Category

code

Aliases

.kts

What opens this file

Android Studio
IntelliJ IDEA
VS Code + Kotlin extension

How to open by OS

Windows

Android Studio, IntelliJ.

Mac

Same.

Linux

Same.

Ios

Kotlin Multiplatform shares logic (UI stays Swift).

Android

Official language.

Safety notes

Because Kotlin runs on the JVM, the same supply-chain issues as Java (Log4j, etc.) apply.

Common mistakes

Overusing !! throws away Kotlin's null safety and returns NullPointerException to your codebase.
Gradle Groovy → Kotlin DSL migrations can break CI when plugin versions aren't pinned.

Related extensions

References

Kotlin official site