I found a nice 64-bit Windows Curl that's been working great for
   me. For example, to add a missing keyword, I do something like
   this n Excel, where identifier is the ID for the item in column
   A: identifier | curl --data-urlencode -target=metadata |
   --data-urlencode -patch=^{\^add\^:\^/subject/1\^,
   \^value\^:\^KennethUdut\^}^ | --data-urlencode
   access=mysecretaccess | --data-urlencode secret=mysecretsecret |
   ="[1]http://archive.org/metadata/" & A1 Then I copy it into
   Notepad++ and replace the ^ with " Then save it as a batch file
   and run it. Works perfectly.

References

   Visible links
   1. http://archive.org/metadata/