Hooky772
You are not providing specific details about the bgl file in question so I will provide answers that you may already know.
Runway 12, EZ Scenery, and Instant Scenery are all designed to place Library Objects. I don't know if you can place normal scenery objects even if you know the GUID number. I tried once and could not get it to work. I might have been doing something wrong I don't know.
Lets specifically look at importing an EZ Scenery Library for use in Rwy12. The library for this example is Nimitz library located at flightsim.com look for ez-nim.zip and ez-nimup.zip. Once you have all the files extracted to the same folder inside the scenery folder you will find a text file. This text file contains all the GUID numbers and names you need to put in an XML file.
To set up a new library in Rwy12 you need to add an xml file to the Rwy12 program folder. For this example name it.
add_EZ-Nimitz.xml
The contents of the xml file are pretty simple. The first line is the doctype declaration.
PHP:
<?xml version="1.0" encoding="utf-8" ?>
Next follows the objects defined in the library.
*note I don't know if comments actually work in Rwy12 they may cause a problem. They are included here as part of the example. You can omit them when creating your own xml file.
PHP:
<!-- this is a comment. Rwy12 should ignore this line. -->
<!-- The first tag is to start the objects library. Later we will close this tag which is a must. -->
<objectsLibrary>
<!-- Now we start a category. You can create sperate catagories or just one the choice is yours -->
<category name="Carriers">
<!-- The next tag defines an individual object. The names and GUID should all be taken from the EZ-Nimtz.txt -->
<!-- By default Rwy12 looks for the object image in its "img" folder. If you define a folder it must be in Rwy12/img/ -->
<!-- If you do not have an image for the file Rwy12 will generate an error when you select the catagory. -->
<obj name="CVN71"
guid="AD5948C14B88798A0697058E9A1C506A"
image="EZ-Nimitz"/>
<obj name="CVN72"
guid="CA6C90AE402D2EB3195AFD90BB9F83A9"
image="EZ-Nimitz"/>
<!-- add the balance of the carrier objects to this list. -->
<!-- The catagory must be closed with the tag below. Remeber it is not necessary to have multiple catagories -->
</category>
<!-- Catagory 2 -->
<category name="Hard Decks">
<obj name="CVN_Deck"
guid="3DD37FFF45AF6E8094208AB8208EF634"
image="EZ-Nimitz"/>
</category>
<!-- Catagory 3 -->
<category name="Wake Effects">
<obj name="CVN Wake"
guid="98BB117641643C56598142A73F28D69E"
image="EZ-Nimitz"/>
</category>
<!-- Closing tag for objects library -->
</objectsLibrary>
If this does not help you provide specifics on the bgl file you are working with and we can further advise you.