Alfresco stores metadata in the relational database and content in the file system. The file system where it stores the content binaries (and other things) is usually referred to as the "alf_data" directory because that's the name of the directory that Alfresco is configured to point to out-of-the-box.
If your goal is to tell Alfresco to store its content binaries on a Windows file server, you could change the "dir.root" property in alfresco-global.properties to point to a remotely mounted file system. However, you do NOT want to do this. That's because the dir.root property points to a directory that includes both the content and the Lucene indexes. Lucene indexes need to be on local storage. So you should also change the dir.contentstore property, like this:
