SFX modules:
a) SFX modules are not compressed by UPX anymore, so they are
larger now. UPX compression caused numerous false alerts
by antivirus software. If you wish to use compressed modules,
you can get UPX from
UPX: the Ultimate Packer for eXecutables - Homepage and compress
*.sfx files in WinRAR folder;
b) The default SFX logo can be replaced by a custom bitmap file.
You can do it either with "Load SFX logo from the file" option
in "Text and icon" part of "Advanced SFX options" dialog
or using -iimg command line switch. Note that -iimg is not
supported by console RAR, only GUI WinRAR recognizes it.
This option is not supported in Windows 95, 98 and Me.
Also you cannot use it if you compressed SFX modules by UPX.
c) It is possible to specify user defined SFX icons larger than
32x32 and with any color depth. Like the previous item,
this improvement is valid only if SFX modules are not compressed
by UPX and your operating system is not Windows 9x/Me;
d) DOS.SFX module moved to RAR/DOS32 distributive. If you need
to create DOS SFX archives using WinRAR, just copy DOS.SFX
to WinRAR folder.
There is lot more information available [link=http://www.rarlab.com/rarnew.htm]
Over Here[/link]