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The ACT is a file type that is associated with the ‘ADPCM Compressed files’ that are recorded by some MP3 players or voice recorders. ADPCM, short for Adaptive Differential Pulse Code Modulation, is a waveform codec that quantizes the difference between a speech signal and a prediction of a speech signal, instead of quantizing the […] Learn more about act
The MPA file extension is used for a Map Layer file, used by BusinessMAP that is created by ESRI and contains merely mapping layers. BusinessMAP is a mapping software that creates pushpin and color-filled maps from the information in databases and spreadsheets. Learn more about mpa