{
  "image/jpeg": "jpg",
  "image/jpg": "jpg",
  "image/gif": "gif",
  "image/png": "png",
  "image/bmp": "bmp",

  "application/zip": "zip",
  "application/x-rar": "rar",
  "application/x-7z-compressed": "7z",
  "application/x-gzip": "gz",
  "application/x-tar": "tar",

  "application/pdf": "pdf",

  "application/msword": "doc",
  "application/vnd.ms-excel": "xls",
  "application/vnd.ms-powerpoint": "ppt",
  "application/vnd.openxmlformats-officedocument.wordprocessingml.document": "docx",
  "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet": "xlsx",
  "application/vnd.openxmlformats-officedocument.presentationml.presentation": "pptx",

  "text/markdown": "md",
  "text/plain": "txt"
}