macOS: Cannot open image by double-click when path contains special characters like []<>

[nmsbnmsb1]

Describe the bug
On macOS, double-clicking an image in Finder fails to open it in PicView when any folder in the file path contains special characters such as [, ], <, or >. The app either does not respond or opens without loading the image. Drag & drop into the PicView window works correctly.

To Reproduce

1. Create a folder with special characters in its name, e.g. [123] Photos
2. Place any image file inside it
3. Set PicView as the default app for that image type
4. Double-click the image in Finder
5. PicView fails to open the image

Expected behavior
The image should open normally, identical to the behavior when dragging and dropping the file into PicView.

Screenshots
N/A

Additional context

• Drag & drop works correctly, so the issue is specific to the double-click / file association code path
• Confirmed affected characters: [ ] < >
• Suspected cause: on macOS, files opened via Launch Services are passed to the app as a file:// URI. These characters are reserved or illegal in URI syntax (RFC 3986), so if the path is being parsed as a Uri object without proper escaping, it will fail. Drag & drop likely bypasses this URI parsing, which is why it works.

Version
PicView-4.2.0-macOS-arm64

• This issue was not present in PicView-4.1.2-macOS-arm64.dmg

[Ruben2776]

Hi there, thanks for your bug report.

The 4.1.2 version used the UrlsOpened event, which Avalonia deprecated for some reason. The 4.2.0 version uses Avalonia's IActivatableLifetime.Activated functionalit, which seems to work worse and slower in my experience. So I believe the issue is from Avalonia's side.

I am in the process of reworking the code base for the 5.0 version, which already uses Avalonia v12. I can roll back to use the UrlsOpened event and release a hotfix version 4.2.1 of PicView, but I will need it to be fixed on Avalonia's side before I could release my v5.