set in if statment and parenthesis

In the cmd script rosbe-gcc-env.cmd there is a position like this:

if not defined _ROSBE_HOST_MINGWPATH (
set _ROSBE_MODE=MinGW
set _ROSBE_HOST_MINGWPATH=%CD%
set _ROSBE_ORIGINALPATH=%PATH% <<< Error
)

Output :

C:\TEMP>
"\Python" kann syntaktisch an dieser Stelle nicht verarbeitet werden.
C:\TEMP> set _ROSBE_ORIGINALPATH=C:\Program Files (x86)\Python
C:\TEMP>

i have tuncate the PATH env. to %PATH%=C:\Program Files (x86)\Python to test
if this is a problem with my path env. but with only this line it will also
make the error.

When i use the "set _ROSBE_ORIGINALPATH=%PATH%" outside the if - statment it will not raise an error.

Sorry for the german error text but i don't know the english text.

I have Vista 64 Bit with PowerShell

Daniel Zimmermann