Prop to XML Tool
This tool either needs to be run from the command prompt, or by dragging a desired prop file onto it in Explorer. I recommend the latter. The tool will create an XML file in the same directory as the .prop file you dragged.

XML to Prop Tool
The same principals apply, you can run it from the Command Prompt or drag a desired XML file onto it in explorer. From there it'll convert the XML into a .propnew. Rename this to .prop before creating your mod's .package.

.Package Creator
This tool can only be run from the Command Prompt. It takes two arguments. The first argument is the name and location you want your mod's .package to be, and the second is the path to the files.xml for your mod. (Explained Below)



Example usage:
Gibbed.Spore.PackageMaker mymod.package files.xml

Now, I'm sure you're wondering what this "files.xml" is. When you extract a .packfile in Package Viewer it creates a files.xml, which contains every single file in the .package. Edit this to only include the files you're including in your mod, and then path to it with Package Maker.

How should I open .XML files?:
You can use just about any text editor, if you don't want to download anything simply use Notepad. I personally recommend Notepad++.

Mod Maker:
More coming soon. For now the tool should be self explanatory. This serves as an alternate .Package Maker.