https://bugs.winehq.org/show_bug.cgi?id=6682
--- Comment #40 from Artem S. Tashkinov t.artem@mailcity.com --- (In reply to Bruno Jesus from comment #37)
Thanks for testing, I can't reproduce the problem with alt+tab but since the bug is very old and you are still testing I trust your tests.
Anyway, are you also testing 3.98?
Oops, for IrfanView 3.98 this bug is indeed fixed.
IrfanView 4.44 still exhibits the problem.