Try in PrePoMax 2.1.0, support for material names with @ was added in 2.0.6 dev version: A developer/preview PrePoMax version v2.0.6 has been released
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Try in PrePoMax 2.1.0, support for material names with @ was added in 2.0.6 dev version: A developer/preview PrePoMax version v2.0.6 has been released