MSB3121: يفتقد عنصر اقتران الملفات في بيان التطبيق إلى سمة واحدة أو أكثر من السمات المطلوبة التالية: extension أو description أو progid أو default icon.

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MSB3121: The file association element in the application manifest is missing one or more of the following required attributes: extension, description, progid, or default icon.

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