|Any chance that you and Karadenizli are the same person? Strikingly similar questions asked within days of each other...|
Anyway, I assume you mean that you are opening the HTML file in a browser window.
The browser knows nothing about the XLSTART folder or even the Excel application per se.
Excel is the app that is configured to look for an XLSTART folder when the app is launched. The browser is not.
Click Here Before Posting Data or VBA Code ---> How To Post Data or Code.