It seems that when you import older MMW files to AceMoney, they will be saved as the AMJ files afterwards. Probably no other software handles these file types.
Convert AceMoney financial data file to AceMoney database.
We have found one software suitable in our database for this conversion.
Multiplatform software - convert mmw to amj on any platform
A personal finance manager
Convert from mmw 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.