If the 'common dialogs' can be updated, then I also think they should be updated. I don't know if mIRC uses its own dialog (that looks like windows default from 98), or one that is provided by windows itself. If it is a custom dialog for mIRC, then it may not be possible to upgrade to winXP style otherwise it may not be compatible with win98, etc. I don't think this is really necessary specifically for loading remotes/aliases/etc because they are usually in the mIRC dir anyway, but it would be helpful for using in scripts that are used to choose any type of file from any location.
-genius_at_work