I would like to generate one separate export file for each album in my library. An album may contain several discs in different sub directories, and I would like to have the file located in the root directory corresponding to each album. I have roughly 1500 album directories.
Do you know if this is possible, either through Mp3tag directly, or perhaps using an automation tool in windows?
This is currently not possible. As @ohrenkino pointed out above, it's possible to let Mp3tag create one export file per directory. Your requirements differ a little from that.