HOWTO: Creating an OPEN IV Package Installer

http://docs.openiv.com/doku.php?id=packages:overview

when you create the winrar package just rename the extention to .oiv and thats it. 

sample package http://docs.openiv.com/files/Package11.zip

complete code on link,

OIV Package version 2.1 must be a ZIP archive without password, the compression level is not important.

Files
List of files and folders inside package archive:

assembly.xml
icon.png
content
assembly.xml

Type: XML File
Required: Yes
The main package file, contain metadata, appearance and content description.

icon.png

Type: PNG Image
Required: Optional
The icon representing this mod. Must be exactly 128×128 (px) size.

content

Type: Folder
Required: Yes
Folder with files of mod.

assembly.xml
Root node must be named “package” and must have three required sub nodes: “metadata”, “colors”, “content”.

<?xml version="1.0" encoding="UTF-8"?>
<package version="2.1" id="{12345678-90AB-CDEF-1234-567890ABCDEF}" target="GameId">
    <metadata>
    ...
    </metadata>
    <colors>
    ...
    </colors>
    <content>
    ...
    </content>
</package>
Package attributes

version

Type: Package Version
Required: Yes
Value: “2.1”
The version of package format, always equal “2.1”

this method should make your mods alot easier to install 

Package Contents.

your dlc.rpf must be in the content folder.

hope this helps. uploading just the rar file will have the same results, but will trigger a manual review on LSPDFR