Search Path
Max can find files for you without requiring that you type the entire path name. For example, if you type "mypatch" into an object box, Max will look for a file with the name mypatch. The file could have a extension after the word mypatch, as long as the extension is one appropriate for the type of file required by the search. For an object box, appropriate extensions include .maxpat (Max 5 format patcher file), .mxb (old binary format patcher file), .mxo or .mxe (external object), and .pat (old format patcher file).
Max has a collection of folders where it searches for files, called the search path. The search path lets you reference a file only by its name, without worrying about where the file resides. It works as follows:
Viewing your current file search path

You can use the Max File Preferences window to add additional places to look, or to change current locations