VMware tar modification

[nimdamsk]

Hello.

There is such a company - VMware. It produces virtualization software,
including ESXi hypervizor. Most of ESXi distribution files are internally
packed with modified tar algorithm.
Sometimes people need to modify ESXi image - i.e. add some software
or absent drivers, etc. As VMware uses its own tar modification the only
way to do the job is to use ESXi console and its internal vmtar utility.
I'd like to have vmtar packer\unpacker as standalone executable, which
i could use in Windows.
The best option would be 7-Zip to support vmtar, but topic on 7-Zip forum
has no answers yet. There are some more info in that post, including
some Python code from VMware itself.
I tried to make some python script hacking, but being not a programmer,
my attempt failed. I will be much appreciate to any help - any utility to
compile to .exe, any script or something similar to use.

Thanks.

[Shelwien]

http://nishi.dreamhosters.com/u/vmtar_0.rar

[nimdamsk]

Thank you, Eugene! You've helped me a lot.

[nimdamsk]

Hm... I've found 2 .vtar files which were not completely converted to .shar.
Here is one of them, .vtar and .tar converted with official utility: http://rghost.net/28391321
35 MB .vtar is converted to 3 MB .shar.
Can you look at this?

[Shelwien]

http://nishi.dreamhosters.com/u/vmtar_1.rar

[nimdamsk]

This helps, thank you once again.