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The reason it shows up as Document 1 is that it will open the file as read only if it thinks it is damaged. This means that you cannot just save again on top of the original file. But if you go to the file menu, you can do a "save as" and name the file whatever you'd like to name it. After that, it will have the new name on it. Just don't save it under the same name or you will overwrite the original file.
Once you "save as", you become the author. When you open the new file, it should not have problems with running the macros in the file since, by default, you trust your own documents. If it does ask you, you should only have to answer it once as long as you save the file after that.