After the recent upgrade, I can't open a md file.

 I get the following error message which roughly translates to "Cannot load the file or assembly  'System.IO.Abstractions, Version=, Culture=neutral, PublicKeyToken=96bf224d23c43e59' PublicKeyToken=96bf224d23c43e59' or a file or assembly subordinated to this. Manifest definition of the assembly and assembly reference do not match. (Exception HRESULT:0x80131040).

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