This is strange behaviour. The command line you showed would write text 
representation of fingerprints to C:\OUTPUTNAME.smi, which you may not 
have intended but should not be catastrophic. Possibly the environment 
variable BABEL_DATADIR has become corrupted. Try re-setting it (via the 
Control Panel) to the directory containing the OpenBabelData data files.
With the 2.3.1 this is probably  something like C:\Program 
Files\OpenBabel-2.3.1\data (I've forgotten exactly where on Windows XP). 
The latest OpenBabel release is 2.3.2.

Chris

On 08/02/2013 02:40, JimJoyner wrote:
> Running openbabel from the command prompt (WIN XP),
> accidentally ran it with no input file:
>
> obabel c:\INPUTname.smi -O c:\OUTPUTname.smi -ofpt -xfFP3
>
> After this, tried with the input file there with a list of SMILES,
> get error message:
>
> "cannot open aromatic.txt"
>
> and it reverts to saved data for the output file.
>
> Tried uninstalling and reinstalling openbabel 2.3.1 with no change.
>
> Previously something similar happened with openbabel 2.3.0
> and using openbabel under a different user name on the computer worked.


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