On Thursday, February 23rd, File Transfer Manager (FTM) 5.0 will be
released. When a new file transfer is initiated,
you will be asked to download the FTM 5.0 client. Existing downloads with
the FTM 4.0 will continue, only new downloads are affected.

What's new in FTM 5.0:
Multi-Segment Download Acceleration provides acceleration for high latency
Internet connections. Download acceleration is only used if a file is
greater than 2 MB and download acceleration is set to No Speed Limit in
FTM's options.
File verification. FTM 4.0 validated each data block as files were
transferred. FTM 5.0 goes one step further to verify file integrity by
validating the full file after it has been written to disk.

Download link:
http://transfers.ds.microsoft.com/ 
(MSI or ActiveX install available)