Both the .aex files and .fan files are used for graphical greeting cards and as such it should be possible to convert one to another using dedicated card making software like Greeting Card Factory Deluxe or similar.
Convert Greetings card file to Greeting Card Factory file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert aex to fan on Windows
Program used to create quality greeting cards
Convert from aex 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.