How to Save 3ds Max Files for Older Versions

3ds Max files are not forward-compatible — a scene saved in a newer release won't open in an older one unless you export it correctly.

Use File → Save As and pick an earlier version from the “save as type” dropdown (3ds Max supports saving back a few releases). For larger version gaps, export to a neutral format such as FBX or OBJ.

Always keep a native copy of your latest file as the master, and treat the downgraded file as a one-way deliverable for collaborators.