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Recently, there has been a spike in searches for an "x-ms-dos-executable decoder plugin download." If you are looking for such a plugin, stop right here. You likely do not need a plugin; you need a application x-ms-dos-executable decoder plugin download
Since there isn't a single "plugin" that works across all browsers, the best way to handle these files is through specialized emulation software: file, you aren't actually looking for a browser plugin