Found an IBM technotes about this:
<a href="http://www-01.ibm.com/support/docview.wss?uid=swg1LO46275">http://www-01.ibm.com/support/docview.wss?uid=swg1LO46275</a></div>
LO46275: LOTUSSCRIPT NOTESMIMEHEADER.SETHEADERVAL DISPLAYS INCORRECTLY ACCENTED CHARACTER
Local fix:
Use doc.Subject
so in our case, How to fix it?
In Custom Controls
Open browser_sendFiles
In the Source code look for these lines:
// Setup the MIME Subject Header
var mailMIMEHeaderSubject:NotesMIMEHeader = mailMIME.createHeader("Subject");
mailMIMEHeaderSubject.setHeaderVal(applicationScope.emailPreSubject + " : " + thisDoc.getItemValueString("file_Subject"));
Add commentary symbol// to them
// Setup the MIME Subject Header
//var mailMIMEHeaderSubject:NotesMIMEHeader = mailMIME.createHeader("Subject");
//mailMIMEHeaderSubject.setHeaderVal(applicationScope.emailPreSubject + " : " + thisDoc.getItemValueString("file_Subject"));
Then add these lines instead:
var thisSubject:String = applicationScope.emailPreSubject + " : " + thisDoc.getItemValueString("file_Subject");
mailDoc.replaceItemValue("Subject",thisSubject);
Tested here and works fine now with accented char in subject line.