Cannot convert .xif to .png

[Siparti]

Dear reader,

I'm trying to convert old .xif files to .png

I've downloaded XnConvert and I can add the files to the converter, I've then selected Output, target source, filetype to PNG:

press convert gives me :

C:\ ... UH3.xif 0x0x0 : no picture

and it does nothing.

can anyone help?

Kind Regards,

Sip