If it has existing stylesheets, are they all stored in the root of the epub? Or are some css stored in a different place?
The addbookpath routine literally prepends the path to the plugin working directory to the file path built from its book path. This simply can not be at the root level of the C drive. As the plugin's work directory is created in temp with a unique path.
I will create an epub3 that is flat with no organizing or grouping folders but with a existing css file at the root level of the epub to see if I can recreate what you are seeing.
Is there anything else unique about your test epub?
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