| AdditionalInfo | Provides file type information for a non-Windows attachment. |
| ContentBase | Contains the content base header of a MIME message attachment. |
| ContentDisposition | Contains the content disposition header of a MIME message attachment. |
| ContentId | Contains the content identification header of a MIME message attachment. |
| ContentLocation | Contains the content location header of a MIME message attachment. |
| CreationTime | Gets or sets the creation time. |
| Data | Contains binary attachment data. |
| DataObject | Contains attachment's data as embedded object. |
| DisplayName | Contains the display name of the attachment. |
| EmbeddedItem | Contains Item object if the attachment is an emabedded item. |
| Encoding | Contains the encoding for an attachment. |
| Extension | Contains a file name extension that indicates the document type of an attachment. |
| FileName | Contains an attachment's base file name and extension, excluding path. |
| Flags | Contains flags for an attachment. |
| IsContactPhoto | Indicates whether this attachment is a contact photo. |
| IsHidden | Indicates whether an attachment is hidden from the end user. |
| LastModificationTime | Gets or sets the last modification time. |
| LongFileName | Contains an attachment's long filename and extension, excluding path. |
| LongPathName | Contains an attachment's fully-qualified long path and filename. |
| Method | Contains a MAPI-defined constant representing the way the contents of an attachment can be accessed. |
| MimeSequence | Contains the MIME sequence number of a MIME message attachment. |
| MimeTag | Contains formatting information about a MIME attachment. |
| ObjectType | Contains the type of the attachment. |
| PathName | Contains an attachment's fully-qualified path and filename. |
| RecordKey | Contains the record key for an attachment. |
| Rendering | Contains a Microsoft Windows metafile with rendering information for an attachment. |
| RenderingPosition | Contains rendering position index. |
| Size | Contains attachment's size in bytes. |
| Tag | Contains an object identifier specifying the application that supplied an attachment. |
| TransportName | Contains the name of an attachment file modified so that it can be associated with TNEF messages. |