Hello Gerald,
what kind of file system is the server of? If it is a windows file server, then the Pages document is shown as a folder with several files in it, because a Pages document is a package, not a single file.
The "index.xml" (or if it is packed: "index.xml.gz") file is the main document file, in which all the description of the text and layout is stored. All the other files are images etc. which are inserted into the Pages document. Pages don't store media files as binary descriptions in the text document like a Word file does. A Pages document is (like the ending shows) a XML-description.
See it like a HTML page (if you know this kind of "document"). You have a description how something should look like and where to find media files that should be shown in it. The media files are stored somewhere else, and you can describe the location of this media files in the HTML code. But for better handling, Pages stores all files into a package, which appears in a Mac system like one single file, so the average user has not to worry about where he/she should store all the single objects.
But if you save this very Mac specific file onto other systems, you see an ordinary folder with many files in it. Maybe the copy procedure has corrupted the package information and Pages is no longer able to handle this as a "document". I heavn't tried this by myself with Windows, but with Linux there are no problems with copy to it and back.
Are the ".pages" endings there on the server? if not, add the endings to a folder and try to open this document with Pages. Or copy a Pages document folder back to a Mac and try to open it than.
Frank.