Fusion
From Insurgency
Fusion Script (or simply Fusion) is a script that can be used to merge Winrar archives with several common file types. This is useful in sharing information over Imageboards (especially illegal/sensitive content). It is very simple to use, a copy of it can be found in the image on this page (just save and change the file from jpg to rar).The current version (v4.1) allows you to merge both RARs and ZIPs with JPGs, PNGs, GIFs, BMPs and SWFs! Enjoy and use it wisely Anonymous.
Fusion using the Command Prompt
Files may be merged without a script using the Windows command prompt. To begin with move the two files you wish to merge into the C: drive. Open the command prompt using Start -->Run and entering "cmd". If your prompt does not look like C:\\ then enter "cd .." until it does. Then enter "copy /b [filenameone.extension] + [filenametwo.extension] [outputfile.extension]" to create the merged file outpufile.extension. By renaming the extension it alters the way the file behaves.