.FLIF files not shown in IrfanView Thumbnails

[Bosanek]

Hello!

I have IrfanView v4.57 x64 with plugin pack.

I have a folder which contains .PNG, .WEBP and .FLIF files.

IrfanView Thumbnails shows .PNG and .WEBP files in the folder, but not any .FLIF file. Therefore, I can not perform batch operations on a group of .FLIF files.

IrfanView viewer opens any .FLIF file normally when invoked from Windows Explorer or Total Commander.

Why .FLIF files are not displayed in IrfanView Thumbnails software? How to solve it?

[Kuki Dent]

Have you tried to add JFIF to the associated file types? Works for me.
You may need to start Iview with admin rights in order to change this setting.

[Bosanek]

Thank you for the suggestion. Although your suggested solution was not the one, it gave me the idea to double-check other settings in that dialogue.
My instance has "Load custom file types" option selected. FLIF was not listed there. Once I manually added it and restarted IrfanView, I solved the problem.