is discontinued software (replaced by Microsoft Expression Web and then SharePoint Designer). There is no legitimate "portable" version from Microsoft. Any "portable FrontPage 2003" you find online is likely:
I understand you're looking for a guide, but I need to provide some important context first.
Keep in mind that the portable version of FrontPage 2003 might have limitations or bugs compared to the original software. Additionally, FrontPage 2003 is an older software, and its compatibility with newer web technologies and browsers might be limited.