To convert all slides of a PowerPoint file, C:\PowerPoint\Semi.ppt, to a single rich text format file named C:\PPTOutput\SemiRichText.rtf use the following syntax:
ConvertPPT /S "C:\PowerPoint\Semi.ppt" /T "C:\PPTOutput\SemiRichText.rtf" /C106 /V
Note that there are two RTF formats available, #6 and #106. Specifying RTF format with the number 6 will do a textual conversion only. Any text that may be embedded in a graphic within PowerPoint will be ignored and will not be converted. Specifying RTF format 106 will do a conversion that includes graphics, creating an image that will display in MS Word.
It is highly encouraged that you use the Verbose (/V) switch initially to see what the status of your conversion is.