NPPMarkdownPanel.dll v0.9.1 Incompatible with Notepad++ v8.9.3

[Rtw915]

System Environment

• Operating System: Windows 11 25H2
• Notepad++ Version: 8.9.3 (x64)
• Plugin Version: 0.9.1

Summary

NPPMarkdownPanel fails to load and prevents Notepad++ from opening. This occurs both when installed via the internal Plugins Admin and when installed manually from the GitHub release.

Troubleshooting Timeline

1. Initial Attempt: Plugins Admin

• Installed version 0.9.1 via the built-in Plugins Admin.
• Result: Notepad++ refused to open, showing the error: "NPPMarkdownPanel.dll is not compatible with the current version of Notepad++".
• Check: Verified DLL properties; the "Unblock" option was not present, so Windows security was not blocking the file at this stage.

2. Recovery Workaround

• To restore Notepad++ functionality, I had to manually delete the following directory:
  C:\Program Files\Notepad++\plugins\NppMarkdownPanel
• Result: Notepad++ opened successfully once the folder was removed.

3. Manual Installation Attempt

• Downloaded NppMarkdownPanel-0.9.1.0-x64.zip directly from GitHub.
• Unblocking: Noticed that these files did have the "Unblock" option in Properties. I manually unblocked every file within the package.
• Installed the unblocked files manually into the plugins folder.
• Result: The same compatibility error persists, and Notepad++ again refuses to launch.

[phase3dev]

I ran into this issue today as well. Although the error message specifically blamed NPPMarkdownPanel.dll, I was able to narrow the problem down to the NppAnotherMarkdown plugin, which bundles the standalone NPPMarkdownPanel plugin along with additional libraries.

NPPMarkdownPanel v0.9.1 had been working fine for me with Notepad++ 8.9.3 until today. The problem only appeared after I installed NppAnotherMarkdown.

Because the popup specifically referenced NPPMarkdownPanel.dll, I first removed the standalone NPPMarkdownPanel plugin from Notepad++ and manually reinstalled the latest release, v0.9.1, from GitHub. I got the same popup, and Notepad++ still would not open. I then tried the previous release, v0.9.0, with the same result.

At that point, since standalone NPPMarkdownPanel v0.9.1 had worked normally before NppAnotherMarkdown was installed, I removed NppAnotherMarkdown completely and reinstalled standalone NPPMarkdownPanel v0.9.1. Immediately after that, the error disappeared, Notepad++ opened normally again, and the plugin worked as expected.

TL;DR: While the error message points to NPPMarkdownPanel.dll, in my case the actual trigger appears to be NppAnotherMarkdown, or something it installs alongside it. The latest release of NppAnotherMarkdown was only three weeks ago, but it seems to have broken something.

[baka0815]

It's the same for me. It was NppAnotherMarkdown which broke NppMarkdownPanel.

[pejotigrek]

in my case Notepad++ starts with no issues, but NppMarkdownPanel doesn't open - either automatically, or manually triggered. I have no other markdown plugin [especially no NppAnotherMarkdown]. Markdown Panel worked fine until it doesn't. tried to reinstall - with no luck

Npp 8.9.3 64-bit, NppMarkdownPanel 0.9.1.0

[mohzy83]

Your observation is correct. It is not possible to run NppMarkdownPanel and NppAnotherMarkdown side by side.
There is an issue when two plugins try to use WebView2 from the same process (notepad++).
I think there is a similar issue with the "Preview HTML" Plugin.

[rdipardo]

I think there is was a similar issue with the "Preview HTML" Plugin.

F.Y.I. That was fixed a while ago.