[Errno 193] %1 is not a valid Win32 application

[bcbc]

User reported error when running wubi rev245 in standalone mode: refer to http://ubuntuforums.org/showthread.php?t=1890287 for more info and more log file. Installing in the old wubi method worked fine.

12-03 11:44 DEBUG TaskList: New task download
12-03 11:44 DEBUG TaskList: ### Running download...
12-03 11:44 DEBUG downloader: downloading http://releases.ubuntu.com/11.10/ubuntu-11.10-wubi-amd64.tar.xz > C:\ubuntu\disks\ubuntu-11.10-wubi-amd64.tar.xz
12-03 11:44 DEBUG downloader: Download start filename=C:\ubuntu\disks\ubuntu-11.10-wubi-amd64.tar.xz, url=http://releases.ubuntu.com/11.10/ubuntu-11.10-wubi-amd64.tar.xz, basename=ubuntu-11.10-wubi-amd64.tar.xz, length=507143012, text=None
12-03 11:59 DEBUG TaskList: ### Finished download
12-03 11:59 DEBUG downloader: download finished (read 507143012 bytes)
12-03 11:59 DEBUG TaskList: ## Finished get_diskimage
12-03 11:59 DEBUG TaskList: ## Running extract_diskimage...
12-03 12:01 DEBUG TaskList: ## Finished extract_diskimage
12-03 12:01 DEBUG TaskList: ## Running choose_disk_sizes...
12-03 12:01 DEBUG WindowsBackend: total size=18000
  root=17744
  swap=256
  home=0
  usr=0
12-03 12:01 DEBUG TaskList: ## Finished choose_disk_sizes
12-03 12:01 DEBUG TaskList: ## Running expand_diskimage...
12-03 12:02 DEBUG TaskList: ## Finished expand_diskimage
12-03 12:02 DEBUG TaskList: ## Running create_swap_diskimage...
12-03 12:02 ERROR TaskList: [Errno 193] %1 is not a valid Win32 application
Traceback (most recent call last):
  File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
  File "\lib\wubi\backends\win32\backend.py", line 468, in create_swap_diskimage
  File "\lib\wubi\backends\common\utils.py", line 58, in run_command
  File "\lib\wubi\backends\common\utils.py", line 52, in spawn_command
  File "\lib\subprocess.py", line 547, in __init__
  File "\lib\subprocess.py", line 701, in _execute_child
WindowsError: [Errno 193] %1 is not a valid Win32 application
12-03 12:02 DEBUG TaskList: # Cancelling tasklist
12-03 12:02 DEBUG TaskList: # Finished tasklist
12-03 12:02 ERROR root: [Errno 193] %1 is not a valid Win32 application
Traceback (most recent call last):
  File "\lib\wubi\application.py", line 58, in run
  File "\lib\wubi\application.py", line 132, in select_task
  File "\lib\wubi\application.py", line 158, in run_installer
  File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
  File "\lib\wubi\backends\win32\backend.py", line 468, in create_swap_diskimage
  File "\lib\wubi\backends\common\utils.py", line 58, in run_command
  File "\lib\wubi\backends\common\utils.py", line 52, in spawn_command
  File "\lib\subprocess.py", line 547, in __init__
  File "\lib\subprocess.py", line 701, in _execute_child
WindowsError: [Errno 193] %1 is not a valid Win32 application