You can use the PreviewFiles method to get the compressed zip of the zip file. To determine that size of a self-extracting zip file, you can use the same method but you will need to add the size of either the 16bit or the 32 bit SFX modules. You can find the these modules, in the Program Files/Xceed Components/Xceed Zip Compression Library/Sfx folder.
Imported from legacy forums. Posted by Jenny [Xceed] (had 343 views)