Save all of multipage TIFF fails (in File menu)

[kempelen]

Hi,

To reproduce:
1. Open a Multipage TIFF
2. File -> Save opened image(s)...
3. It asks for folder, choose one.
4. It asks to confirm "Do you want to save all pages?" press OK.

Current result:
An alert box is shown: "Error opening file <>".

I found I can extract with Tools -> MultiPage! But still the above may be a bug or something is not right with it.