[Open Babel] Similarity search

[<ma...@li...>]

Hi,

I tried to do a similarity search but I did not work.
I did this way:

first I created an index:
babel DS001.smi DS001.fs

then I tried to do the search using tanimoto coefficient parameter
babel DS001.smi RS001.smi -sSMILES -ifs -at0.6

Than I got this message.
==============================
*** Open Babel Error  in ObtainTarget
  Filename of pattern molecule in -S option must have an extension
0 molecules converted
1 errors 5 audit log messages

Could anyone help me?
Thanks

Max