Thanks Tim, this has solved the problem.  As you suggested, you need to make 
the .fs file on the same architecture you are running Openbabel




________________________________
From: Tim Vandermeersch <tim.vandermeer...@gmail.com>
To: macc_200 <macc_...@yahoo.co.uk>
Cc: openbabel-discuss@lists.sourceforge.net
Sent: Wed, 12 May, 2010 18:42:09
Subject: Re: [Open Babel] fast index search on linux




On Wed, May 12, 2010 at 5:23 PM, macc_200 <macc_...@yahoo.co.uk> wrote:

Hi,
>I have installed openbabel 2.2.3 on an ubuntu 10.04 machine via the apt 
>installer but I am having problems substructure searching an indexed database 
>viz:
>> babel VS_Library_full.fs -ifs -s'N#Cc1c(Cl)cccc1' results.smi
>==============================
>*** Open Babel Error  in ReadChemObject
>  Difficulty opening VS_Library_full.sd
>
>0 molecules converted
>1 errors 19 audit log messages 
>
>
>(note it is trying to open an sd file not an fs file)
>
>Searching an sd file with this smiles string works fine.  Also, under windows 
>and openbabel 2.2.3, searching this same .fs file works OK using the command 
>prompt and this command.  
>The obvious solution here is to use windows but I need to write a shell script 
>to search through a lot of molecules and really need to get it working on 
>linux.  What should I be doing here?
> 

Have you tried recreating the index on linux. I'm not sure if these binary 
files are portable across platforms. Others know more about this though.
 

thanks,
>Andy
>
> 
>
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