Hello!Nominally this is done like this:- the file of the desired format (* .max) is selected in the explorer file and the right key is pressed- there is a context menu in which you need to select the "Open with ..."- Then opens the same window and there is a list of applications that can be associated with this type of file- To specify an association with the desired type of program, it is enough to select it from the list and then turn on the checkbox "Always use the selected program to open this kind of file"That's it, those are the file associations in Windows.After that, always, by launching the file of the selected format, this application will be launched.If the desired application is not listed, you can select the executable file for the desired application by clicking the "Browse" button and specifying its location on the drive itself.As for your situation, or rather the situation with different versions of 3ds Max in the system, I also encountered such a problem and, if I'm not mistaken, then the * .max association can not be assigned to the file through the above described function, even with the help of "Browse". 3ds Max persistently ignores the association change and runs the * .max file using the latest (by date) version of Max installed. Apparently, the installer 3ds Max in the registry prescribes associations, as a result of which the system does not have the concept of Max version, there is simply 3ds Max application and everything, and what is 3ds Max application, is prescribed when installing the max itself 🙄 I would call it "gnarly "The implementation of this function, but maybe I'm wrong and there is some elegant solution. But I do not know.In this connection, the most rational (without the need for manual editing of the Windows registry) is a banal rearrangement of the required version of Max, after which the last version installed in the system will take on associations. In my opinion, if you put max on top of Max, it will not affect the plugins, nor does it require re-activation. So this way of "assigning an association"😁 will be the least painful.
Once again faced with the problem described gus_ann, namely installing 3ds Max 2008 after an already established earlier 3ds Max 2013 - * .max files persistently began to open in 3ds Max 2008 by default, instead of 3ds Max 2013.
I decided as follows:
1 - Download a program Open With for-purpose associations.
2 - It in the main menu via the "Add" to ".max" extension added 3ds Max 2013 by specifying let his "3dsmax.exe".
3 - A «Open with ...» appointed only use that association created to «* .max» files (instead of 3ds Max, in the menu has two options).