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diff --git a/mailnews/compose/public/nsIMsgAttachmentHandler.idl b/mailnews/compose/public/nsIMsgAttachmentHandler.idl
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index 000000000..ac7c4f825
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+++ b/mailnews/compose/public/nsIMsgAttachmentHandler.idl
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+interface nsIFile;
+
+// This interface provides minimal XPCONNECT access to objects of type
+// nsMsgAttachmentHandler. This is primarily for use with new account
+// types and JsAccount, so this is probably not the interface that you
+// want if you are working with standard account types.
+
+[scriptable, uuid(1731283c-60fe-4102-a804-622a84cc1a08)]
+interface nsIMsgAttachmentHandler : nsISupports
+{
+  /// The real type, once we know it.
+  readonly attribute ACString type;
+
+  /// URI with link to the attachment.
+  readonly attribute ACString uri;
+
+  /// The temp file to which we save it.
+  readonly attribute nsIFile tmpFile;
+
+  /// The name for the headers, if different from the URL.
+  readonly attribute AUTF8String name;
+
+  /// Size of the attachment, in bytes.
+  readonly attribute unsigned long size;
+
+  /// This is for multipart/related Content-ID's.
+  readonly attribute ACString contentId;
+
+  /// True if this should be sent as a link to a file.
+  readonly attribute boolean sendViaCloud;
+
+  /// Name of the character set for the attachment.
+  readonly attribute ACString charset;
+
+  /// The encoding, once we've decided.
+  readonly attribute ACString encoding;
+
+  /// Whether the attachment has been encoded, for example to base64.
+  readonly attribute boolean alreadyEncoded;
+};