I'm just released english version. Enjoy!
http://dsrt.boom.ru/down-eng.htm
MPWGUI is a simple GUI (simple enough for a school girl) for processing audio mono/stereo files.
Multi-channel files downmixed to stereo automatically.
Freeware. "Drop & Forget technology"
(!)Without external encoders/decoders MPWGUI can only convert WAV PCM to AAC-LC by iTunes.
See readme.txt for details.
Decode
AAC, AC3, AIF, APE, AVI, DTS, FLAC, MPA, MP2, MP3, MP4/M4A (AAC), MPC, OGG, VOB, WAV (PCM), WMA, WV
Encode
APE LOSSLESS
AAC/MP4/M4A (LC, HE-LC, HEv2, Main (HC), LTP)
[AAC Encoders: iTunes/FAAC/NeroDigitalAudio]
FLAC LOSSLESS
MP3-LAME CBR/VBR/ABR
MPC
OGG-aoTuV
WAV (PCM)
WV LOSSLESS
Tag support
MP3, APE, FLAC, OGG, WV, MPC (write/read).
MP4/M4A (write only).

Great tool, how about adding twolame encoding?

I add it on the next release

Great! thanks ever so much.

MPWGUI v2.2 is out.
+MP2 (TWOLAME)
+OFR LOSSLESS
+MP2,MP4,OFR tags support.
...and some bugs is wiped out.