I have to import some UTF-8 encoded text-file into my C++Builder 5 program. Are there any components or code samples to accomplish that?
You are best off reading all the other questions on SO that are tagged unicode and c++. For starters you should probably look at this one and see whether library in the accepted answer (UTF8-CPP) works for you.
I would however first think about what you're trying to achieve, as there is no way you can just import UTF-8-encoded strings into "Ansi" (what ever you mean by that, maybe something like ISO8859_1 or WIN1252 encoding?).