My guess would be that the RichTx32.ocx on Win98 is earlier version than on WinXP. Did you try to install the WinXP version of the control on Win98?

>
>i am using the RichTx32.ocx RTF control in my, which works just fine in WinXP so far. however, today i came across something i didn't expect: in windows 98 2 of my control words are ignored. let me explain:
>
>i programaticly change a .RTF file (a simple txt file saved throught this rtf control) and based on some information found in the file add 3 rtf control words:

>- \uld         -> underline
>- \v           -> hide
>- \v0          -> end hide
>- highlight7   -> highlight

>
>the whole string at the end looks some like this:

>"\uld{\v " +"MyHiddenText"+ "\v0\highlight7 " +"MyUnderlinedHighlightedText"+ "}\uld0}

>this all looks and works great in WinXP but not in Win98 (tried it on 2 different Win98 machines)
>in windows 98 the control word honored is the /uld - which underlines, but neither the hidden or the highhlight (i got a color table definition earlier in the file) control word is processed.
>
>if i just take the modified rtf file and open it on the same computer in ms word, it displays correctly.
>
>any idea why?