Depends on the online application that you never mention. If it is a web
page, just add a:
<A href={url} target=_blank>My resume</A>
tag in your web page to let readers click on the link to open it in another
window. The {url} is wherever you stored the .doc file in your disk quota
for your web page(s); i.e., it is wherever you uploaded the file.
That's just one example of how to make your file available using a link. It
may not apply to whatever "online application" you are talking about and
never revealed.