This button is relatively simple, when you click it two dialogs pop up: one for the filesize (in MB) and the other for the RAR name. This can come in handy for uploading large folders/files to services such as Mediafire or iFile which have limited upload sizes.
Make sure to replace rar with the path to rar.exe on your computer.
<?xml version="1.0"?>
<button display="both">
<label>New RAR</label>
<tip>Creates a new RAR file with choosable file size and name</tip>
<icon1>123</icon1>
<function type="normal">
<instruction>"rar" a -v{dlgstring|Size in MB}m -m0 "{dlgstring|Filename}.rar" {allfile$} </instruction>
</function>
</button>