With Filestar you get 55 different skills for working productively with Ogg Vorbis Speex File (.spx) files.
About .Spx
Name
Ogg Vorbis Speex File
Extension
.spx
Format
Binary
Category
Audio
Developer
Xiph.Org
Description
Audio file compressed using Speex compression and saved in the Ogg Vorbis container format; designed as an audio compression format specifically for speech; compresses voice at 2 to 44 kbps and supports 8 kHz, 16 kHz, and 32 kHz compression in the same bitstream.