Nick,
It was not necessary to update POI to the latest version. The fix is that you need to give more memory for OpenRefine to work with your file.
I was able to launch OpenRefine at the Windows 7 command line with:
C:\Users\eguitha\git\OpenRefine>refine /m 4096m
which gives OpenRefine 4096 megabytes (4 gigs) of memory to work with. I am using a 64bit Java JDK installation on my Windows 7 laptop.
It took about 20 seconds for "Inspecting selected files" to finish and was able to see the rows/column in our Preview grid.
I then continued to import the file, and then exported it as an OpenRefine project file (automatically gzipped) for your use.
I have attached the project file via Google Drive which you should be able to import into OpenRefine using "Import Project" :