In the past I've been using the MAS to sell my apps but this year decided to sell them through my website. Part of which was to have to come up with my own licensing scheme which involved sending the customer a license file. I had set the file association through the File Type and tested it to see that it is working.
For a weird case for just one customer when he downloaded the license file and double click it while it is in the download folder, he claims his MacOS shows that there is no associated application.
However when he drags the license file to the Desktop and double click on it, the file association is recognized and invoke the OpenDocument of the app.
Even when he did invoke the OpenDialog routine with the FileType set to the license file format, the file is greyed out while it is in the download folder and not when it is in some other folder. He used Safari for the download
In general, is there a reason why the file association is not recognized in one folder but it is when it is out in another ?
I don't have a problem here nor had any complains from the other customers.