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I have discovered that if you create an XML web resource, export it, and then import it into a CRM Online or CRM 2011 on-prem org with UR10+, an extra character is introduced into the XML content.

Using Fiddler, if I open the web resource that has been imported into CRM to view the XML content, and look at the RAW content that's returned, I found that a stray 'zero width no-break space' Unicode character () is inserted at the beginning of the XML content. Notice the two characters before the word 'clickdimensions' in the content below: