Cannot open pdf file using custome scheme handler

[abid76]

This is a duplicate of https://stackoverflow.com/questions/73906457/cefsharp-doesnt-display-local-pdf-file-after-upgrade-to-105-3-390

Setup:
OS: Windows 11
.NET Version: .NET Framework 4.8
Architecture: x86

After upgrading from 79.1.360 to 105.3.390 I cannot open pdf files when using a custom scheme handler. When trying to open a pdf file using "local://path/to/file.pdf" Windows OS opens a window saying: You'll need a new app to open this chrome-extension link.

When using file scheme everything works fine. Furthermore, I checked out the tag v105.3.390 and added my custom scheme handler to CefSharp.Wpf.Example: everything works fine.

I have absolutely no idea what's going on and how to solve this issue ... any help is appreciated!

[abid76]

Found it out myself. When opening a PDF file, an additional URL is processed: chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/index.html (anybody knows why?).

I was using a RequestHandler which delegates all none local URLs to the default OS browser. This causes the OS to open the window

You'll need a new app to open this chrome-extension link.

See all details on stackoverflow.

[amaitland]

When opening a PDF file, an additional URL is processed: chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/index.html (anybody knows why?).

This is expected. The PDF viewer migrated from being a PPAPI Plugin to being an internal extension a while back.

https://source.chromium.org/search?q=mhjfbmdgcfjbbpaeojofohoefgiehjai&ss=chromium