In Oxygen XML Editor, can I automatically xcopy a folder to my Transformation's output folder?

I am using version 21 of the Oxygen XML Editor and the DITA Map WebHelp Classic (deprecated) Transformation Scenario. I have a folder that contains HTML files I want to open in a new window/tab, so that are xref'd in my XML file such as:

[<b><xref href="External/aFile.html" format="html" scope="external">Some Text</xref></b>]

I have a PostProcess batch script that I manually run that does an xcopy of the External folder to Oxygen's out/webhelp folder, and I would like to instead run it automatically in Oxygen after the Transformation is done. Is there I way I can do this?

Solution

Two ways:

1) Use your custom ANT build file in the Oxygen transformation scenario: To use a custom build file in a DITA-OT transformation, follow these steps:

Use the Configure Transformation Scenario(s) action to open the Configure Transformation Scenario(s) dialog box.
Select the transformation scenario and click Edit.
Go to the Advanced tab and change the Custom build file path to point to the custom build file.

As an example, if you want to call a custom script before running the DITA OT, your custom build file would have the following content:

<project basedir="." default="dist">
<!--The DITA OT default build file-->
 <import file="path/to/DITA-OT3.x/build.xml"/>
 <target name="dist">
   <!--Call the DITA OT default target-->
   <antcall target="init"/>
  <!-- You could run your script here -->
  <!--<copy></copy>-->
 </target>
</project>

2) Create your own DITA Open Toolkit plugin which adds a new transformation type with a custom ANT build file which calls the WebHelp transformation type and afterwards can perform the copy operation:

https://www.oxygenxml.com/doc/versions/21.1/ug-editor/topics/whr-xslt-customization.html