Xfdf issues

So, I have the code running to create the .xfdf and attach it to the proper account. Everything looked perfect, until I went to open my file. Instead of the .xfdf opening and overlaying the online form, it instead downloads a new copy of itself. Is there an issue in my xlm? What am I doing wrong here. Below is the code, and I have verified the .xfdf's are coming out correctly.

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public with sharing class CreateIO {

    DateTime nowDT=System.now();
    String formatted=nowDT.format('MM-dd-yyyy');

private String getXmlString(JJSale__c a)
{


    String s = '<?xml version="1.0" encoding="UTF-8"?>' +
        '<xfdf xmlns="http://ns.adobe.com/xfdf/" xml:space="preserve">' +
        '<f href="https://na11.salesforce.com/resource/1300398748000/IO_JJ"/>' +
        '<fields>' +
        '<field name="Acct Rep"><value>' + a.CreatedBy.Name + '</value></field>' +
        '<field name="Ad Cost"><value>' + a.Ad_Price__c + '</value></field>' +
        '<field name="Address"><value>' + a.Organization__r.BillingStreet + '</value></field>' +
        '<field name="Advertiser"><value>' + a.Organization__r.Name + '</value></field>' +
        '<field name="Bill to"><value>x</value></field>' +
        '<field name="City"><value>' + a.Organization__r.BillingCity + '</value></field>' +
        '<field name="Contact"><value>' + a.Contact__r.Name + '</value></field>' +
        '<field name="Date"><value>' + formatted + '</value></field>' +
        '<field name="Email"><value>' + a.Contact__r.Email + '</value></field>' +
        '<field name="Fax"><value>' + a.Contact__r.Fax + '</value></field>' +
        '<field name="INSERTION DATES AND NOTES 1"><value>' + a.Journal_Issue__r.Name + '</value></field>' +
        '<field name="INSERTION DATES AND NOTES 2"><value>' +
            a.Page_Requested__c + ', ' + a.Insertion_Notes__c + '</value></field>' +
        '<field name="Phone"><value>' + a.Contact__r.Phone + '</value></field>' +
        '<field name="State"><value>' + a.Organization__r.BillingState + '</value></field>' +
        '<field name="Todays Date"><value>' + formatted + '</value></field>' +
        '<field name="Zip"><value>' + a.Organization__r.BillingPostalCode + '</value></field>' +
        '</fields><ids original="CB86FA72BFC7A2744D5052A67D1686EE" modified="C0A949601A5BB74AB94C1DAA08D65D2F"/>' +
        '</xfdf>';

    return s;
}

public PageReference XFDFInit()
{
    JJSale__c a = [SELECT Id, CreatedBy.Name, Ad_Price__c, Organization__r.BillingStreet, Organization__r.Name,
                         Organization__r.BillingCity, Contact__r.Name, Contact__r.Email, Contact__r.Fax,
                         Journal_Issue__r.Name, Page_Requested__c, Insertion_Notes__c, Contact__r.Phone,
                         Organization__r.BillingState, Organization__r.BillingPostalCode
                         FROM JJSale__c
                         WHERE id = :ApexPages.currentPage().getParameters().get('id')];
    String xmlContent = getXmlString(a);

    Attachment attachment = new Attachment();
        attachment.Body = Blob.valueof(xmlContent);
        attachment.Name = a.Organization__r.Name + '_' + formatted + '.XFDF';
        attachment.ParentId = a.Organization__r.Id;
        insert attachment;

    PageReference orgPage = new PageReference('/' + a.Organization__r.id);
    orgPage.setRedirect(true);
    return orgPage;
}

}