http://www.whitsoftdev.com/ssft/
Download SSFT here and put this in a INF and ur done =]

--INF File

[Version]
Signature= "$Windows NT$"

[PEBuilder]
Name="SSFT"
Enable=1

[WinntDirectories]
a="Programs\SSFT",2

[SourceDisksFiles]
SSFT.exe=a,,1

[Software.AddReg]
0x2,"Sherpya\XPEinit\Programs","Internet Tools\SSFT","%SystemDrive%\programs\SSFT\SSFT.exe"

an absolutely ingenious tool!

i made a complete plugin, all files included, try it out:
www.fuwi.ethz.ch

i made filetransfer-tests in a minimal BartPE build (no XPE) to remote computers via port 80
works like a charm!

btw: there is no help-function in SSFT, read the instructions on http://www.whitsoftdev.com/ssft/