Office or business etiquette is often confused with social etiquette. When you are in a professional setting, etiquette is gender free.
For example, if a female employee is giving her male guest a tour of her company, she should hold the door open for her guest to walk through. In a social setting, it would polite for the man to hold the door open for the lady.
Do not worry about gender etiquette in the business world. Instead, think of host etiquette which is very similar to the etiquette skills you would use when inviting guests to your home. You do whatever you can to make them feel comfortable in your territory.