I am using irfanview version 4.37 on Windows 7 Ultimate, with all plugins installed.
When running (within irfanview) a slideshow in full screen of a photo album created with picasa, with captions containing french-accented letters, it appears that at least one accented letter -- but unfortunately the most common in French -- the e with acute accent i.e. "é", presumably coded 0xE9, is NOT properly displayed (a question mark in a rhombus is displayed instead). Many other accented letters show properly.
(To get captions entered with picasa, I set in irfanview the text to be displayed to $I120.)
(Choosing French language in irfanview (Options - Change language - French) does not make any difference in the captions).
Does anyone have a clue what is causing this ?