There's no point in trying to run Avisynth under Wine for you, since the part you want is DirectShowSource and that doesn't work under Wine anyway. AFAIK the only multipurpose source filter that works reliably in Avisynth under Wine is FFmpegSource, and since you said there's no FFmpeg decoder for your codec, that won't help you at all.
Avisynth 3 has been very dead for years and even when it was "alive" it was mostly vaporware.
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