To answer my question : Just found a 'plugin pack for 1by1' here :
http://www.mpex.net/forum/viewtopic.php?t=...07e4ce958c873f9d/l :
http://www.mediafire.com/?1crykj0emx2QUOTE
in_wm.dll + Wmaudsdk.dll: Adds support for Windows Media Audio (WMA). No seeking problems or crashes so far.
- "RecommendedPlugins": contains all the DLLs that most people will probably need and in the versions suggested by the Readme, along with those three I added. They will give support for the following (and various other) formats: AAC, AIF, AIFF, APE, AU, CDA (i.e., reading audio CDs), FLAC, M4A, MAC, MID, MIDI, MOD, MP2, MP3, MPC, OGG, VOC, WAV, WMA.
- "OtherPlugins": contains some alternative decoders, like in_cdda for use instead of in_CDReader, in_mad or in_mp3 instead of ACM/mpglib, etc. It also includes "in_snes.dll" (adds support for SNES music files) and "in_mpp.dll" v1.7.9f (for MPC and MP+ files). This last DLL is not working for me, which is why I'm using "in_mpc.dll" v0.99g instead. (in_mpp gives an "Invalid or unknown MP+/MPC bitstream" error when opening more recent MPC files; I believe it's because it was made for MPEGplus, before the transition to Musepack.)