I recently copied a 25.5GB file from another machine using WinSCP. I copied it to C:\beth.tar.gz, and WinSCP can still see the file. However no other app (including Explorer) can see the file. What might cause this, and how can I fix it?

The details that might or might not matter

• WinSCP shows the size of the file (C:\beth.tar.gz) correctly as 27,460,124,080 bytes, which matches the filesize on the remote host
• Neither explorer, cmd (command line prompt w/ dir C:\), the 7Zip archive program, nor any other File Open dialog can see the beth.tar.gz file under C:\
• I have configured Explorer to show hidden files
• I can move the file to other directories using WinSCP
• If I try to move the file to Users/, UAC prompts me for administrative rights, which I grant, and I get this error:

  Could not find this item

  The item is no longer located in C:\

• When I try to transfer the file back to the remote host in a new directory, the transfer starts successfully and transfers data
• The transfer had about 30 minutes remaining when I left it for the night
• The morning after the file transfer, I was greeted with a message saying that the connection to the server had been lost. I don't think this is relevant, since I did not tell it to disconnect after the file was done transferring, and it likely disconnected after the file transfer finished.
• I'm using an old version of WinSCP - v4.1.8 from 2008
• I can view the file properties in WinSCP:
  • Type of file: 7zip (.gz)
  • Location: C:\
  • Attributes: none (Ready-only, Hidden, Archive, or Ready for indexing)
  • Security: SYSTEM, my user, and Administrators group have full permissions - everything other than "special permissions" is checked under Allow for all 3 users/groups (my user, Administrators, SYSTEM)

What's going on?!