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The acoustic and acoustooptic properties of a weakly multimode solid core photonic crystal fiber (PCF) are studied. The phase velocity of the lowest order flexural acoustic mode is measured as a function of frequency and compared with the results for a hollow core PCF and a standard optical fiber. Acoustooptic interaction is used to couple light from the lowest order to the first higher order optical modes of the solid core PCF. The experimental results are compared with theoretical predictions.