Worked fine in: XnView MP v1.8.8 (x64)
Broken since: XnView MP v1.9.0 (x64) up to v1.11.5 (x64)
OS: Windows 10 / 11 (x64)
Description:
In version 1.8.8, if a folder contains no loose image files but contains ZIP archives with images inside, the folder thumbnail automatically previews the 1st image from the 1st ZIP archive.
Since version 1.9.0 (including the latest 1.11.5), this behavior is broken. Folder thumbnails can only show direct image files, and images inside ZIP archives are completely ignored for folder preview.
Folder Structure Example:
Plaintext
Folder/
├─ 001.zip
│ └─ 001.jpg <-- Should be displayed as folder thumbnail when no loose images exist
└─ 002.zip
└─ 001.jpg
Steps to Reproduce:
Create a folder containing only ZIP archives (each ZIP containing image files) and no direct image files.
Open XnView MP and browse to the parent directory.
Observe the generated folder thumbnail.
Expected Result:
The folder thumbnail shows the 1st image from 001.zip (Works in v1.8.
.Actual Result:
The folder thumbnail fails to preview the image inside the ZIP archive and displays a generic folder icon instead (Broken in v1.9.0 ~ v1.11.5).
Additional Info:
I have attached my xnview.ini file from v1.8.8 (where this functionality works as expected) for your reference.
Below is a screenshot showing the folder thumbnail preview working normally.