Both .a6r and .a5r files originate from Adobe Authorware and if any program can somehow handle them or perhaps even perform some sort of conversion it would be this one. Sadly, we haven't found any other relevant information about this conversion or whenever it is actually possible.
Convert Adobe Authorware packaged file without runtime to Adobe Authorware packaged file without runtime.
We found one software available in the database for this conversion.
Microsoft Windows software - convert a6r to a5r on Windows
Visual authoring tool for creating rich-media and e-learning applications
Convert from a6r file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.