First create solution

Nuvolar.Web/GetAttachments.ashx.vb

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+Imports System.Web
+Imports System.Web.Services
+Imports Nuvolar.Module
+Imports DevExpress.ExpressApp.FileAttachments
+Imports DevExpress.Persistent.BaseImpl
+Imports DevExpress.Data.Filtering
+Imports System.IO
+Imports DevExpress.Web.Internal
+
+Public Class GetAttachments
+    Implements System.Web.IHttpHandler
+    Private _Session As DevExpress.Xpo.Session
+    Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
+        Dim _Oid As String = context.Request.QueryString("id")
+        Dim _ConnectionString As String = ConfigurationManager.ConnectionStrings("ConnectionString").ToString
+        Dim _Attachment As FileData
+
+        _Session = New DevExpress.Xpo.Session
+        _Session.ConnectionString = _ConnectionString
+        _Session.Connect()
+
+        If _Session.IsConnected Then
+            _Attachment = _Session.FindObject(Of FileData)(CriteriaOperator.Parse("Oid=?", _Oid))
+
+            If _Attachment IsNot Nothing Then
+                Dim _Stream As New MemoryStream
+                _Attachment.SaveToStream(_Stream)
+                HttpUtils.WriteFileToResponse(Nothing, _Stream, _Attachment.FileName, True, "")
+            End If
+        End If
+    End Sub
+
+    ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
+        Get
+            Return False
+        End Get
+    End Property
+
+End Class