all the other files are.mp3 or.wav (in rar format)
An example is here : 
Can I convert them into a format compatible with my Windows 7?
I've tried several programs but none of them can extract.rar files from my archive, I don't have enough knowledge to know what program can open the rar file.
I am only interested in the audio streams, I don't need the video files.
The process should be reversible so that I can put back the audio files into the.rar file
Thank you very much
A:
You can use WinRAR for that. 
From the manual: 
Support for ZIP archive formats. 
Support for RAR archives.
  (Extracts the RAR archive into the specified directory.)
Support for ZIP archives. 
Support for UnRAR archives.
  (Extracts the UnRAR archive into the specified directory.)
And then just do a "Extract" and it should do the job. 
There's also a "Convert" option. 
Occurrence of rheumatic fever in the United States, 1985 through 1988.
Incidence and prevalence of rheumatic fever (RF) are not well defined in the United States. An active surveillance system was initiated to determine the occurrence of RF in a defined geographic area and the overall incidence of RF in the United States. This study was conducted in nine geographically defined areas in the United States from 1985 through 1988. A telephone survey was used to collect the demographic and clinical data. Culture and/or detection of rheumatogenic bacterial antigens were performed on patients meeting diagnostic criteria for RF. One hundred thirty-six of 18,996 (0.7%) cases of RF were confirmed by culture. Ninety-four patients met the diagnostic criteria for acute RF; 78 patients met the criteria for subacute RF; and four met the criteria for chronic RF. These numbers represent the incidence of RF in the nine US areas. The mean annual incidence rates were 0.6 for acute, 0.3 for subacute, and 0.05 for chronic RF cases per 100,000 population. The percentage of cases of RF with accompanying pharyngitis was 78. 3125841983

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