I use to receive tar.gz files fromm colleagues but unpacking them with 7zip is not convenient as it unpacks a tar file from gz first while I usually seek to get the tar file contents (so I have to unpack the tar file explicitly next).

I've tried adding tar -zxvf %P%N command to Total Commander button bar but it turned that tar -zxvf doesn't work but returns the following error (tried it in bare command prompt):

tar: Cannot fork: Function not implemented
tar: Error is not recoverable: exiting now

I have got both GnuWin32 and cygwin installed, but I seek a solution that will work in Windows command line promt (and so will be callable from Totat Commander), not in cygwin command line promt.