A Study of Three-Prong Tau Decays with Charged Kaons                           
  
From an analysis of the ionisation energy loss                                 
of charged particles selected from                                             
a sample of 147926 tau pair candidates recorded in the OPAL                    
detector at centre-of-mass energies near the Z0                                
resonance, we determine the branching ratios:                                  
Br(tau -> K-pi0pi+(>=0pi0)) = 0.343 (0.073) (0.031)                            
Br(tau -> K-pi0K+(>=0pi0))  = 0.159 (0.053) (0.020)                            
The tau -> K-pi-pi+(>=pi0)  final states occurring through                     
tau -> K-K0s(>=0pi0) are treated as background in this analysis.               
We also examine the resonant structure of \tkpp\ candidates.                   
Under the assumption that the resonant                                         
structure is dominated by the K$_1$ resonances,                                
we determine that the ratio of the Br(tau -> K1(1270)) to the                  
Br(tau->K1(1270))+Br(tau->K1(1400)) is 0.71(0.16)(0.11).                       
In all results, the first uncertainties are statistical and the second         
are systematic.                                                                
  
 Parallel session :7                   
 Plenary  session :3