You need to open the $file as utf-8 (or set the utf-8 layer using binmode), and set the STDOUT mode to utf-8 too: 
binmode(STDOUT,":utf8");
open(FILE,"<:utf8", "$file");
my @Lines = <FILE>; 
close(FILE); 
$page = "<html>". join("",@Lines) ."</html>"; 
print "Content-Type: text/html; encoding=utf-8\n\n"; 
print $page;

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See also perlunicode

update: also perlio - and note that you should never set the :raw layer (i.e. use binmode(FILEHANDLE) - without a second argument) on a (unicode) text file unless you're sure you know what you're doing.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Reading in utf-8 txt file gives garbled data when printed as part of utf-8 html... by Joost
in thread Reading in utf-8 txt file gives garbled data when printed as part of utf-8 html... by isync

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