# ReactOS fixes merged-folder usage and investigates a crash when pasting files

DevFeed: [ReactOS fixes merged-folder usage and investigates a crash when pasting files](<https://devfeed.tech/articles/funny-title-not-found-32780.md>)

Original publisher: [Read original article](<https://reactos.org/blogs/funny-title-not-found/>)

Published: 2014-12-07T00:00:00Z

Content type: article

Language: en

Sources: [Front Page on ReactOS Website](<https://devfeed.tech/sources/front-page-on-reactos-website.md>)

Topics: [ReactOS](<https://devfeed.tech/topics/reactos.md>), [opensource](<https://devfeed.tech/topics/opensource.md>), [Windows](<https://devfeed.tech/topics/windows.md>)

Tags: [classes](<https://devfeed.tech/tags/classes.md>), [crash](<https://devfeed.tech/tags/crash.md>), [files](<https://devfeed.tech/tags/files.md>), [free](<https://devfeed.tech/tags/free.md>), [net-11](<https://devfeed.tech/tags/net-11.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [opensource](<https://devfeed.tech/tags/opensource.md>), [os](<https://devfeed.tech/tags/os.md>), [react](<https://devfeed.tech/tags/react.md>), [reactos](<https://devfeed.tech/tags/reactos.md>), [win32](<https://devfeed.tech/tags/win32.md>), [winapi](<https://devfeed.tech/tags/winapi.md>), [windows](<https://devfeed.tech/tags/windows.md>)

## AI overview

A ReactOS developer describes returning to work on merged-folder usage after investigating a crash when pasting files. The article explains that Windows classes were not working because the filtering callback's return values were misunderstood: S_FALSE indicates that an item is shown, while S_OK indicates that it should be filtered away.

## Source excerpt

Hello everyone, If you remember from last week, my top priority was to investigate the crash when pasting files, but because Giannis insisted a bit that I should fix the merged folders usage so that the windows classes can be used instead of our own, I went back to the merged folders, and started looking at why the windows classes didn't work. The first thing I had to fix was a misunderstanding of the return value of the filtering callback, which returns S_FALSE if the item is shown, and S_OK if the item has to be filtered away.