Content type for OPEN WITH dialogbox

Question

+     // set the http content type to "APPLICATION/OCTET-STREAM+
                    response.setContentType("APPLICATION/OCTET-STREAM");
                    +// Setting file name in header in order to save with same name+
                    String disHeader = "Attachment;Filename=\""+fileNameStr+"\"";
                    response.setHeader("Content-Disposition", disHeader);
when I am using above code to open the files from the database, and filename stored with the extension then open dialog box is gets opened and and click on open will open the document/ file in respective/default software installed.
I want open with dialog box to select the software by which the file should be opened, for that when I remove the extension from the filename, its taking html as a default content type and opening in the browser.
How to do it .. ?

Answer 1

you are correct but its client requirement that when he click on the the filname he want to look open/save dialog box and when he clicks on the open , OPEN WITH DIALOG should appear where he can choose the program/software to open the file.