How to open a ECM file

There is a free program called unecm.exe to open ECM files. Just drag and drop the ECM file on to the unecm.exe icon. Then it will decode the file. unecm is a application which is used to decompress the ECM files. Usually converting a 600MB file to a ECM file format will reduce about 100MB (i.e. the file will become 500MB size). Roughly, converting a normal files into ECM will reduce 16-17% of the actual size.

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