[tex-live] Failed "tlmgr update --self"

[Akira Kakuto]

> The command "tlmgr update --self" recently failed.
> (On two computers running WinXP.)
> 
> A message from tar-win32 said it couldn't update tlmgr.exe
> because access was denied.
> 
> Subsequently there was an attempt to restore the previous
> version with the same error message from tar-win32.
> 
> Updating via update-tlmgr-latest.exe was no problem.
> 
> This is the first I was aware that tlmgr.exe even exists.
> I thought tlmgr.pl has always been started from tlmgr.bat.

tlmgr.exe is a wrapper for scripts.
On windows, it it usually impossible to
write opened files.  So an error occurs
to update tlmgr.exe if the starting program
is itself.

Best regards,
Akira