When trying to open a readonly file with the provided MDITextEditor sample, the CXTPSyntaxEditDoc::OnOpenDocument() returns FALSE which fails to open the document.

This is because CXTPSyntaxeditDoc::SaveFileData() is called and the default implementation returns FALSE when files with readonly flags set are opened. I did not dig deeper into code, but it looks strange that immediately after opening a file its written back.

Is this behaviour really what codejock developers wanted to implement. For me it seems more obvious to be able to open readonly files without any change in code.