I've noticed the following issue with Rapid PHP 5 (6.3).
(It already appears in some ways in other older topics, but it's still unfixed)
When you select the menu item "HTML > Encoding", the tag <meta http-equiv="content-type" content="text/html; charset=xxx"> is added or updated, but, and that is the issue, the way the file is saved doesn't change !
For instance, if I select UTF8 as charset, the file should be saved, from then on, as UTF8. It appears that it is always saved with the same charset. It is perhaps Windows OEM ; when I type in the euro symbol, it is encoded with one byte : 0x80 by Rapid PHP, exactly the way Notepad does when you select ANSI (I use a french version of Windows XP).
I think that Rapid PHP does a raw saving of the file without encoding.