For reference:
Playable Disc Formats: CD, CD-R, CD-RW, DVD, SVCD, VCD
Playable File Formats: MP3
By the way, if you want to play other formats in your Philips DVD634, you can convert other formats to MP3 or the formats it supported with a Video Converter software. In this case,
Leawo Video Converter is a good choice. It has lots of powerful functions, such as,
1. Convert video and audio between all formats.
2. Trim, Crop, Effect, Watermark to edit video.
3. Support 2D to 3D conversion.
4. Add external subtitle and select audio channel.
Maybe it could be help. :)
Download Video Converter to Make Conversions Easy and Fast