See Re: List of illegal characters for URL Message #770474 and Re: Escape/UnEscape functions Thread Message #584803. If you're cocerned with spaces only

lcUrl = "file://c:\myfolder\some info.doc"
IF SPACE(1) $ lcUrl
  lcUrl = STRTRAN(lcUrl, SPACE(1), "%20")
ENDIF
...

>one question though.
>this feature not working if a folder or file has a space in them. how can i get around it ??
>e.g. file://c:\myfolder\some info.doc