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`FindFirstChangeNotificationW` expects a `DWORD` (`UInt`) as last parameter, but the constants are all `Int`
Am I supposed to convert it with `toUInt` or is it a problem with the type definitions?

Just a guess, those are probably #define constants and cinterop guesses they're signed by default. I think this is the situation where <https://kotlinlang.org/docs/native-c-interop.html#portability|this section> is relevant, to use a convert&lt;&gt; method, but toUInt should also work. Also, I read something in the patch notes about being able to enable <https://kotlinlang.org/docs/whatsnew19.html#compiler-option-for-c-interop-implicit-integer-conversions|implicit integer casts> in 1.9.0, but that's probably not a great idea.

Thanks <@U019PH8DS2H>! I think in case of WinAPI an implicit conversion sounds fine.