Kadri, was MAX the original format for 3D Studio Max and, if so, what year did they start using the file extension 3DS? If you look up the MAX file extension on Google you also get:
"Saved file created by Datel's Action Replay MAX, a PlayStation 2 (PS2) program used for applying cheats to PS2 games and creating PS2 saves; contains the saved state of a PS2 video game; can be saved to a hard drive or transferred to a PC using a USB flash drive."
and
"Image imported via scanner or created by ScanSoft PaperPort scanning software; saved in a proprietary format used by ScanSoft software."
and
"Scanned image or text document saved by OmniPage scanning software; recognizes characters and words and detects page layout information using OCR software."