The main motivation for writing this script was the Citrix ADMX files. @AdamGrossTX has done a great job of finding and removing broken parts in the Citrix receiver.admx/adml files (see https://github.com/AdamGrossTX/Toolbox/tree/master/Intune/ADMXIngestion ). I took this as an opportunity to create a script that would do this manual process automatically, so that new releases would be fixed automatically. Here's what it does:

• Replace comboBox with textBox - comboBox is not supported by Intune
• Add explainText to all <policy> attributes, as this is also required albeit undocumented currently on the Intune learn page. Will fix 'Object reference not set to an instance of an object.'
• Remove the windows.admx reference if possible, otherwise return information on the usage of 'windows:' references in the log. This will be fixed by Microsoft in the future

ATTENTION: This will not remediate other things mentioned in the official documentation. Official documentation about importing ADMX to Intune: https://learn.microsoft.com/en-us/mem/intune/configuration/administrative-templates-import-custom