To create an embedded window, authors insert an embedded window reference in the RTF source file. This reference has the following general form:
{ewx DLL-name, window-class, author-data}
| Parameter | Description |
| x | A character specifying the alignment of the window: l for a left-aligned window, r for a right-aligned window, or c for a character-aligned window. |
| DLL-name | The name of the DLL that controls the embedded window. The file name should not include an extension or be fully qualified, but it can include a relative path. Windows Help assumes .DLL or .EXE to be the default extension. |
| window-class | The name of the embedded window class as defined in the source code for the DLL. |
| author-data | An arbitrary string, which Windows Help passes to the embedded window when it creates the window. This string can be one or more substrings separated by any punctuation mark except a comma. The DLL is responsible for parsing this string. The string is terminated by the closing brace (}) |
The following example shows a valid embedded window reference:
{ewl FADE, AmfWnd, clipbrd.amf}