Problem exporting to DOCX using DOCM template

Report from the customer:

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My entire tests so far are fine, but I have faced one problem. I am using a Word template containing macros and therefore my template is a “sample.docm”. That leads to some problems as Xporter works fine using the template but the export menu shows “docx” only.

If I try to open an export immediately then Word shows and error about wrong format. I can save the file, which has then .docm as suffix, and open it in Word afterwards. That works fine.
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