Developing the site in a PC environment and using a Unix server has no bearing on this. It is just an issue of spaces in the name. Generally IE will read such names correctly but Netscape will return an error.
If you can see the page on the web but can't open in in FP there are a few ways to handle it:
You could FTP in and retrieve the page from the server. It sounds as though you are using Netscape (or this problem wouldn't be very obvious). Either download IE or have someone with IE save the page and email it to you.
To get the code for the page from the web open the page in IE, click on View, Source which will show the code in Notepad. Save the notepad file to your FP web as an html page with the name you want it to have. If you're using themes or shared borders you may have to tweak it some but it will be faster than recreating the page.
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