The _CLIPTEXT functionality is limited, at least prior to the version 9. Clipboard API combined with either Bitmap or Enhanced Metafile API can do the trick.
The Enhanced Metafile approach is probably the easiest one. Use CreateEnhMetaFile and CloseEnhMetaFile to open bitmap file and obtain handle to it. Use SetClipboardData with uFormat=CF_ENHMETAFILE to place this handle on the clipboard.
Follow the links to get API declarations as well as some FoxPro code samples (members area):