That's where Servant Salamander comes in. Unlike File Manager, it handles long filenames perfectly, and even lets you see the short names in the same list as the long filenames. It also works like Explorer, letting you drag and drop files and folders to or from a Servant Salamander window. Unlike the dreaded Explorer, Servant Salamander knows how to save its own settings so that it opens the same way each time you run it. Servant Salamander has many features you won't find on most other replacements for File Manager.
Salamander fixes that problem nicely.