ตัวแปลงไฟล์ออนไลน์ฟรี HCOM เป็น OGG

Macintosh HCOM files. These are Mac FSSD files with Huffman compression.

This format is free, which apparently is one of the reasons for its popularity. The used codecs supports variable bit rates (as a default), and .ogg files usually play back easily on all platforms. All things being equal, the sound quality exceeds that of mp3 somewhat.