I have an iMac OS 10.7.5  I have been sent a disc using Mac OS extended format which I am unable to open.  Any suggestions?

I am using an iMac OS10.7.5  I have been sent a disc using Mac OS extended format but I cannot open it.  Any suggestions.  I have also tried on my laptop (10.5.8) similarly without success

The disc appears to b an ordinary CD and it contains the text of a manual which comes quarterly.  In the past I have had problems because it came as an exe file and I had to contact the organization concerned to get an alternative Mac friendly disc.  In this instance the information under Find Info is that it is a volume created on 18 September 2013. It is formatted as indicated and its capacity is 135 KB.  There is no indication what I should use to open it.

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