Thanks for your bug report. I was able to reproduce the issue with the file dialog under XP/Wine (which need to use the older file dialogs). This has been fixed for the next version.
As for the appearance of the About dialog, and likely other dialogs, in Wine: this is probably due to not having the correct fonts installed. You will need to use Wine prefixes to install standard Windows fonts. I cannot remember for sure but I think an important one is Tahoma. Note that you may have difficulty with some fonts as Wine download/install fails with some of the font packs.
