Sometimes occures problems with few letters. Its because ä != Ä , Ö != ö and so on..
Also böö iswm BÖÖ returns false. I know that mIRC thinks those marks as different letters, but it would help us who use those letters in normal talk, if it would work sameway as normal A and a

It's because mIRC primarily uses the ASCII charset. In ASCII those characters you listed aren't, strictly speaking, letters. They're actually part of the 'extended character set' which means that they don't have any specific meaning and might not look at all like an A or an O with umlauts above them in a different font.

Apparently mIRC will support Unicode in the future, which does have specific characters for those letters you've listed so when that's added it will (hopefully) work like you want.

yes they are, for us in sweden and a fev other countrys too..

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What he said is true.

Yes, they arent letters but if mirc regonizes a as A and e as E, it also could ä as Ä right?

Yes, it could - somebody already said that Unicode support has been said to be on the 'to do' list for future versions of mIRC. Just because (some) humans interpret them as letters is irrelevant, the point is ASCII doesn't recognise them as that - so you'll need to wait

Regards,

Well it recognizes a as A and e as E because it's part of the ASCII character set. When a program supports any given character set (ASCII, SJIS, Unicode, UCS, ISO-8859-1, etc.) it must be programmed with the 'knowledge' of what each character 'means' (if it has any specific meaning). Since ASCII was designed in the 60s by Americans it only supports English characters and so it doesn't have any special characters which mean ä or ö or any other variations. Although many fonts now use certain extended characters (ASCII #128-255) of ASCII to display as those characters, they do not have any meaning as letters according to the ASCII character set.

Unicode however has support for practically every character for language and mathematics that's in use today, so when mIRC supports that it should correctly recognize ä as Ä, á as Á, ö as Ö, and so on.