I suggest not to download .est file. It may be a version compatibility problem, or a buggy file already. Start from a new file instead and import POI yourself from .txt or .xls files (i guess this is the main used of the file). Than backup your own .est files for yourself later.
In the past, there were small problems with loading .est older files in S&T like with pushpins problems, or with gps trail bug also. I think that creating the .est yourself from scratch and from your own version is the safer way to do it...