The first time you start 3ds Max, the default project folder is your local /3dsmax folder. The path for this might depend on the operating system you use:
C:/users/<username>/my documents/3dsmax/autoback/ (or "3dsmaxdesign" for 3ds Max Design)
You can use Set Project Folder to specify a different location. You can also set the project folder from the Asset Tracking Dialog Paths menu.
When you set the project folder, 3ds Max automatically creates a series of folders within it such as scenes and renderoutput. Saving or opening files from the browser uses this location by default. Using a consistent project folder structure among team members is good practice for both organizing and sharing files.
When you set the project folder, 3ds Max might display a warning that some file paths are no longer valid. If the scenes you are working on belong to the project you have chosen, it is safe to disregard this warning.
3ds Max creates an MXP file (see Configure User Paths) with various paths that pertain to the project folder, and stores it in the folder you have chosen.
To set the project folder:
Use the browser controls to navigate the disk structure to the project folder to use, highlight the folder name, and then click OK.
Click this to create a folder named New Folder within the highlighted folder. When first created, the folder name is highlighted so that you can edit it; use the keyboard to rename the folder, or press to accept the default name.