REA archive filenames contain colons. Those colons trigger gnu tar functionality to try to download a file from a remote PC.
See timo/json_fast#79

I think the best fix would be to prefix the file to extract / introspect with ./ as that triggers gnu tar to not try to do fancy download things. But that needs to be done in a platform agnostic way.

Alternatively one could probe for the edition of tar and if it's supported add the --force-local command line parameter to explicitly disable that functionality.