Sorry for the delay in my response; I've been on vacation.
I'm not sure how that could be that it would be related at all to anything 3rd-party as for me it reproduces even playing a file in a brand-new and unmodified portable version installation. It works everywhere except the taskbar, where Japanese symbols in (Unicode, of course) filenames or (Unicode) tags are turned into question marks, as if SetWindowTextA were being used instead of SetWindowTextW (just for example). I don't have this same issue with Winamp.
I've pasted in a report from a fresh portable installation where the problem occurs. Please advise!
Edit: I have determined that the cause of this lays in gen_win10shell.dll as disabling it fixes the issue. The DLL in question is the unmodified, stock gen_win10shell.dll included with WACUP. I appreciate the functionality this DLL brings and would prefer a fix over disabling it.
-------------------------------------------------
Winamp Info Report
-------------------------------------------------
File was generated by Winamp Info Tool v6.3.0.6332 on: 11-11-2019 at: 03:01:57
© 2011-2019 Christoph Grether
-------------------------------------------------
General Information
-------------------------------------------------
Windows Version: Windows 10 Pro (64-Bit)
System Language: English (United States)
Internet Explorer Version: Internet Explorer is not present on the system
Winamp Version: 5.6.6.3516 (Winamp Standard Version)
Winamp Community Update Project (WACUP) Version: 1.0.8.4346
Winamp Backup Tool Version: Winamp Backup Tool is not present on the system
Winamp Tray Control Icon Pack Version: Winamp Tray Control Icon Pack is not present on the system
Sonic Burning Engine Version: Sonic Engine is not present on the system
Current Skin: Winamp Classic
Current Language Pack: None
Current Output Plug-in: Nullsoft DirectSound Output [out_ds.dll]
Current Visualization Plug-in: MilkDrop 2 [vis_milk2.dll]
Current DSP Plug-in: None
Current CD Ripping Encoding Plug-in: None
Current Transcoder Encoding Plug-in: None
Current File Type Icon Library: None
Current Tray Control Icon Pack: None
-------------------------------------------------
Winamp Directories
-------------------------------------------------
Winamp Installation Path: G:\WACUP
Winamp Configuration Path: G:\WACUP\Settings
Winamp Backup Path: No Backup directory available
Winamp Plug-in Path: G:\WACUP\Plugins
Winamp System Components Path: G:\WACUP\System
Winamp Skins Path: G:\WACUP\Skins
Winamp Language Pack Path: No Language Pack directory available
Winamp Visualization Plug-in Path: G:\WACUP\Plugins
Winamp DSP Plug-in Path: G:\WACUP\Plugins
Winamp File Type Icon Library Path: No File Type Icon directory available
Winamp Tray Control Icon Pack Path: No Tray Control Icon directory available
MilkDrop Presets Path: No MilkDrop presets directory available
AVS Presets Path: No AVS presets directory available
Portable Players Destination Path: Using the CD-Ripping Destination Path (%USERPROFILE%\Music)
Portable Players File Naming Scheme: Using the CD-Ripping File Naming Scheme (<Artist> - <Album>\## - <Title>)
Winamp Configuration File Path: G:\WACUP\Settings\winamp.ini
Media Library Configuration File Path: G:\WACUP\Settings\Plugins\gen_ml.ini
-------------------------------------------------
Winamp General Settings
-------------------------------------------------
Internet Connection Settings: Always Connected (LAN, DSL, Cable)
Taskbar/Notification Area Presence: Winamp is shown in Taskbar only
Priority Class: Normal
Visualization Plug-in Priority: Normal
Allow Multiple Instances: Disabled
Always on Top: Disabled
Recycle permanently deleted files: Disabled
Prevent the mouse wheel from altering the volume: Disabled
-------------------------------------------------
Winamp Playlist Settings
-------------------------------------------------
Repeat Mode: Repeat Mode and Manual Playlist Advance disabled (Repeat None)
Shuffle Mode: Disabled
Current Playlist Font: Arial
Current Playlist Font Size: 11 Pixels
Current Playlist Text Direction: Force left-to-right order
Show Numbers in Playlist: Disabled
Metadata Reading: Metadata will be read, when file(s) are played or viewed in Playlist Editor
Current ATF String: [%artist% - ]$if2(%title%,$filepart(%filename%))
-------------------------------------------------
Winamp Playback Settings
-------------------------------------------------
Volume: 0%
Speaker Balance: Center
Playback Thread Priority: Highest (Default)
Output Bit Depth: 16 Bit Output
Surround Sound: Disabled
Dithering: Disabled
Forced Mono Output: Disabled
ReplayGain Support: Disabled
Equalizer: Disabled
Preamp: +0.0 db
Buffer length: 2000 ms
Prebuffer on start / seek / underrun: 500 ms
Buffer-ahead on track change: 500 ms
Crossfading at start: Disabled
Crossfading on first start: Disabled
Crossfading at end of song: Disabled
Crossfading on Pause/Stop: Disabled
Crossfading On Seek: Disabled
Remove silence at the beginning/end of track: Enabled (Cuttoff: -40 db)
-------------------------------------------------
Registered File Extensions
-------------------------------------------------
There are no file extensions associated with Winamp
-------------------------------------------------
Winamp Input Plug-ins
-------------------------------------------------
in_ape.dll ◆
Version: 4.92.8 | Size: 88.00 KiB
in_audio.dll ◆
Version: 1.1.5 | Size: 12.50 KiB
in_capture.dll ◆
Version: 2.2 | Size: 108.50 KiB
in_cdda.dll ◆
Version: 0.9.8.3 | Size: 88.50 KiB
in_dshow.dll ★
Version: 1.13 | Size: 71.50 KiB
in_flac.dll ◆
Version: 1.1.1 | Size: 43.50 KiB
in_midi.dll ★
Version: 3.55 | Size: 109.50 KiB
in_mod.dll ◆
Version: 0.4.9.12139 | Size: 637.00 KiB
in_mp3.dll ★
Version: 4.103 | Size: 263.50 KiB
in_mp4.dll ◆
Version: 1.3.6 | Size: 182.00 KiB
in_nsv.dll ★
Version: 1.75 | Size: 76.00 KiB
in_sidious.dll ◆
Version: 2.1.5.7 | Size: 203.50 KiB
in_text.dll ◆
Version: 2.9.1 | Size: 35.00 KiB
in_url.dll ◆
Version: 1.5.1 | Size: 87.50 KiB
in_vgmstream.dll ◆
Version: 2.1.2466 | Size: 1.28 MiB
in_vorbis.dll ◆
Version: 1.2.2 | Size: 49.50 KiB
in_wav.dll ◆
Version: 1.4.1 | Size: 15.50 KiB
in_wave.dll ◆
Version: 1.0.4 | Size: 15.50 KiB
in_wv.dll ◆
Version: 5.1.0.6 | Size: 70.00 KiB
in_zip.dll ◆
Version: 1.3.5 | Size: 61.50 KiB
in_wav.trb ★
Version: 2.0.6 | Size: 31.50 KiB
➝ Total: 21 File(s) | 3.48 MiB
-------------------------------------------------
Winamp Output Plug-ins
-------------------------------------------------
out_disk.dll ★
Version: 2.18 | Size: 24.00 KiB
out_ds.dll ★
Version: 2.64 | Size: 52.50 KiB
out_ignorant.dll ◆
Version: 1.0.1 | Size: 6.50 KiB
out_notsoasio.dll ◆
Version: 1.1 | Size: 88.50 KiB
out_notsoyasapi.dll
Version: 1.1.3 | Size: 51.00 KiB
out_wave.dll ★
Version: 2.17 | Size: 19.50 KiB
➝ Total: 6 File(s) | 242.00 KiB
-------------------------------------------------
Winamp Vizualization Plug-ins
-------------------------------------------------
vis_classic.dll ◆
Version: 2.0.2 | Size: 65.50 KiB
vis_milk2.dll ◆
Version: 2.26.11 | Size: 428.00 KiB
➝ Total: 2 File(s) | 493.50 KiB
-------------------------------------------------
Winamp DSP / Effects Plug-ins
-------------------------------------------------
dsp_wc.dll ◆
Version: 1.2.4 | Size: 70.00 KiB
➝ Total: 1 File(s) | 70.00 KiB
-------------------------------------------------
Winamp General Purpose Plug-ins
-------------------------------------------------
gen_3mode.dll ◆
Version: 1.5.5 | Size: 9.00 KiB
gen_bigclock.dll ◆
Version: 1.3.4 | Size: 22.00 KiB
gen_classic.dll ◆
Version: 2.1.8 | Size: 25.50 KiB
gen_classicart.dll ◆
Version: 1.8.5 | Size: 25.00 KiB
gen_exclude.dll ◆
Version: 1.2.4 | Size: 19.50 KiB
gen_ff.dll ★
Version: 1.49 | Size: 1.63 MiB
gen_hotkeys.dll ◆
Version: 2.4 | Size: 47.00 KiB
gen_jumpex.dll ◆
Version: 1.7.5.1452 | Size: 131.50 KiB
gen_ml.dll ★
Version: 3.75 | Size: 318.50 KiB
gen_nos.dll ◆
Version: 1.3.11 | Size: 8.50 KiB
gen_play_remove.dll ◆
Version: 3.1.5 | Size: 40.00 KiB
gen_repeater.dll ◆
Version: 1.2.3 | Size: 14.00 KiB
gen_skinmanager.dll ◆
Version: 1.6.7 | Size: 62.50 KiB
gen_timerestore.dll ◆
Version: 3.1 | Size: 26.50 KiB
gen_transcode.dll ◆
Version: 1.0.12 | Size: 47.50 KiB
gen_undo.dll ◆
Version: 1.4.3 | Size: 33.50 KiB
gen_waveseek.dll ◆
Version: 3.5.3 | Size: 40.00 KiB
gen_wc.dll ◆
Version: 0.2.9 | Size: 48.00 KiB
gen_win10shell.dll ◆
Version: 1.0.1 | Size: 39.50 KiB
gen_win7shell.dll ◆
Version: 3.1.5 | Size: 111.00 KiB
gen_yule.dll ◆
Version: 2.3.2 | Size: 161.50 KiB
➝ Total: 21 File(s) | 2.83 MiB
-------------------------------------------------
Winamp Media Library Plug-ins
-------------------------------------------------
ml_bookmarks.dll ◆
Version: 2.2.2 | Size: 57.50 KiB
ml_devices.dll ★
Version: 1.34 | Size: 152.00 KiB
ml_exporter.dll ◆
Version: 1.2.3 | Size: 34.50 KiB
ml_history.dll ◆
Version: 1.4.8 | Size: 53.50 KiB
ml_ll.dll ◆
Version: 1.0.4.1 | Size: 169.50 KiB
ml_local.dll ★
Version: 3.32 | Size: 317.00 KiB
ml_playlists.dll ◆
Version: 2.8.4 | Size: 185.00 KiB
ml_pmp.dll ★
Version: 2.24 | Size: 280.00 KiB
ml_radio.dll ◆
Version: 1.5.4 | Size: 92.50 KiB
ml_rg.dll ◆
Version: 1.3.9 | Size: 304.50 KiB
ml_wire.dll ◆
Version: 2.18 | Size: 201.00 KiB
➝ Total: 11 File(s) | 1.80 MiB
-------------------------------------------------
Winamp Portable Media Player Plug-ins
-------------------------------------------------
pmp_ipod.dll ★
Version: 0.88 | Size: 157.00 KiB
pmp_mtp.dll ★
Version: 0.99.1 | Size: 111.00 KiB
pmp_njb.dll ★
Version: 0.57 | Size: 20.50 KiB
pmp_usb.dll ★
Version: 1.61 | Size: 52.00 KiB
➝ Total: 4 File(s) | 340.50 KiB
-------------------------------------------------
Winamp Encoder Plug-ins
-------------------------------------------------
enc_fhgaac.dll ★
Version: 1.0.8 | Size: 1020.50 KiB
enc_flac.dll ◆
Version: 1.0.3 | Size: 13.00 KiB
enc_mp3.dll ◆
Version: 1.0.4 | Size: 14.00 KiB
enc_opus.dll ◆
Version: 1.0.2 | Size: 26.00 KiB
enc_vorbis.dll ◆
Version: 1.0.1 | Size: 14.00 KiB
enc_wav.dll ★
Version: 1.0.2.1 | Size: 14.00 KiB
➝ Total: 6 File(s) | 1.08 MiB
-------------------------------------------------
Winamp System Components
-------------------------------------------------
aacdec.w5s ★
Version: 5.6.6.3516 | Size: 902.00 KiB
albumart.w5s ◆
Version: 1.7.0.0 | Size: 23.00 KiB
ClassicPro.w5s
Version: 2.0.3.0 | Size: 127.00 KiB
devices.w5s ★
Version: 5.6.6.3516 | Size: 33.50 KiB
dlmgr.w5s ◆
Version: 1.1.4.0 | Size: 24.50 KiB
h264.w5s ★
Version: 5.6.6.3516 | Size: 666.50 KiB
image.w5s ◆
Version: 1.6.1.0 | Size: 547.00 KiB
jnetlib.w5s ◆
Version: 2.0.5.0 | Size: 26.00 KiB
metadata.w5s ◆
Version: 0.3.5.0 | Size: 24.50 KiB
mp4v.w5s ★
Version: 5.6.6.3516 | Size: 203.00 KiB
pcm.w5s ★
Version: 5.6.6.3516 | Size: 13.50 KiB
playlist.w5s ◆
Version: 3.3.7.0 | Size: 89.00 KiB
tagz.w5s ◆
Version: 1.2.0.0 | Size: 20.50 KiB
timer.w5s ★
Version: 5.6.4.0 | Size: 26.50 KiB
vlb.w5s ★
Version: 5.6.6.3516 | Size: 122.50 KiB
vp6.w5s ★
Version: 5.6.6.3516 | Size: 178.50 KiB
vp8.w5s ★
Version: 5.6.6.3516 | Size: 230.50 KiB
xml.w5s ◆
Version: 2.2.8.0 | Size: 117.00 KiB
freetype.wac ★
Version: - | Size: 326.00 KiB
-------------------------------------------------
Winamp DLL Files
-------------------------------------------------
elevate.dll ◆
Version: 1.0.8.4346 | Size: 7.50 KiB
libcurl.dll
Version: 7.66.0.0 | Size: 2.08 MiB
libFLAC.dll ◆
Version: 1.3.3.0 | Size: 183.50 KiB
libmp4v2.dll ◆
Version: 1.0.0.0 | Size: 153.50 KiB
libopus.dll ◆
Version: 1.3.1.0 | Size: 222.00 KiB
libsndfile.dll ◆
Version: 1.0.29.1 | Size: 343.50 KiB
libvorbis.dll ◆
Version: 1.3.6.0 | Size: 647.00 KiB
lzma.dll ◆
Version: 19.0.0.1 | Size: 30.00 KiB
ml_res.dll
Version: 1.0.8.4346 | Size: 14.00 KiB
mpg123.dll
Version: - | Size: 144.50 KiB
msvcp140.dll
Version: 14.16.27033.0 | Size: 439.48 KiB
nde.dll ◆
Version: 2.3.1.0 | Size: 58.00 KiB
nsutil.dll ★
Version: 5.6.6.3516 | Size: 409.00 KiB
nxlite.dll ★
Version: 5.6.6.3516 | Size: 28.50 KiB
soxr.dll ◆
Version: 0.1.3.0 | Size: 127.00 KiB
SystemMediaTransportControl.dll ◆
Version: 1.1.0.0 | Size: 16.50 KiB
tag.dll ◆
Version: 1.1.1.4 | Size: 557.00 KiB
tataki.dll ★
Version: 5.6.6.3516 | Size: 86.50 KiB
unrar.dll ◆
Version: 5.80.2.3196 | Size: 155.00 KiB
vcruntime140.dll
Version: 14.16.27033.0 | Size: 78.98 KiB
winamp.dll ◆
Version: 1.0.8.4346 | Size: 872.00 KiB
winamp_res.dll
Version: 1.0.8.4346 | Size: 194.00 KiB
zlib.dll ◆
Version: 1.2.11.3 | Size: 102.50 KiB
msvcp90.dll ◆
Version: 9.0.30729.6161 | Size: 556.33 KiB
msvcr90.dll ★
Version: 9.0.30729.6161 | Size: 637.83 KiB
at3plusdecoder.dll
Version: - | Size: 328.50 KiB
avcodec-vgmstream-58.dll
Version: 58.43.100.0 | Size: 1.90 MiB
avformat-vgmstream-58.dll
Version: 58.25.100.0 | Size: 703.01 KiB
avutil-vgmstream-56.dll
Version: 56.25.100.0 | Size: 603.51 KiB
libatrac9.dll
Version: - | Size: 40.00 KiB
libcelt-0061.dll
Version: - | Size: 34.50 KiB
libcelt-0110.dll
Version: - | Size: 50.50 KiB
libg719_decode.dll ◆
Version: - | Size: 49.00 KiB
libg7221_decode.dll ◆
Version: - | Size: 46.00 KiB
nsvdec_vp3.dll ★
Version: 5.6.6.3516 | Size: 100.50 KiB
nsvdec_vp5.dll ★
Version: 5.6.6.3516 | Size: 170.50 KiB
lame_enc.dll ◆
Version: 3.100.2.1 | Size: 164.50 KiB
read_file.dll ★
Version: 5.6.6.3516 | Size: 84.00 KiB
d3dx9_31.dll
Version: 9.15.779.0 | Size: 2.30 MiB
D3DX9_42.dll
Version: 9.27.952.3001 | Size: 1.80 MiB
-------------------------------------------------
Winamp Language Packs (.wlz)
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Language Files (.lng)
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Classic Skins (.wsz)
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Modern Skins (.wal)
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Skins (.zip)
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Skins (in a Folder)
-------------------------------------------------
Bento [Size: 288.20 KiB]
Big Bento [Size: 830.05 KiB]
Big Bento Modern [Size: 2.65 MiB]
Big Bento Modern Light [Size: 893.55 KiB]
Big Bento Modern Windows 10 Edition [Size: 2.28 MiB]
Big Bento Modern Windows 10 Edition Light [Size: 1.35 MiB]
Winamp Classic Modern [Size: 895.03 KiB]
Winamp Modern [Size: 911.81 KiB]
Winamp Modern Holiday [Size: 78.93 KiB]
➝ Total: 9 File(s) | 10.09 MiB
-------------------------------------------------
MilkDrop Presets
-------------------------------------------------
None installed
-------------------------------------------------
AVS Presets
-------------------------------------------------
None installed
-------------------------------------------------
Winamp File Type Icon Libraries
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Tray Control Icon Packs
-------------------------------------------------
None installed
-------------------------------------------------
Winamp Backups
-------------------------------------------------
No Winamp Backups present
-------------------------------------------------
Legend
-------------------------------------------------
●●● Hidden user name
★ Official shipped component
◆ Official shipped WACUP component
(!) Component with known compatibility issues
-------------------------------------------------
End of Report
-------------------------------------------------
Topic: Unicode Taskbar Title (Read 5280 times)