OS: Windows 10 - 64bit
When selecting non-image files and then creating a contact sheet the non-image files are listed on the contact sheet.
Effect: Wrong/unexpected behaviour
To reproduce:
1. In XnView browser select a mixture of image files (e.g JPEG files) and non-image files (e.g. thumbs.db).
2. Select Tools » Create contact sheet...
3. In "Contact sheet" dialog select "Preview" tab.
Actual behaviour (bug): In Preview tab you see both image files and non-image files. For non-image files there's just an empty area.
Expected behaviour: In Preview tab you see image files, only.
