I took the plunge recently, forking over $20 for the Bordeaux GUI front-end for Wine, the non-emulator that allows users of Linux (and Solaris and FreeBSD) to run Windows applications on their Unix-like computers. More here
And I saw plenty of Wine users have trouble with Irfanview. Codeweavers, who I’d rather deal with than Bordeaux, doesn’t make any promises in regard to Irfanview. Bordeaux does.