Hola,
Lo que quiero hacer es crear un listado, dividido por grupos... pero dentro de un combobox, para utilizarlo desde VB6... para un programa tipo EXE...
Ahora, la solución que encontré es la siguiente:
Voy a escribir un control "<select>" propio de HTML... para mostrarlo en mi programa... a travez de una instancia de InternetExplorer... con un control WebBrowser, por ejemplo...
algo así... estos son parte de los datos reales...
Cita: <select>
<option>Seleccionar...</option>
<optgroup label="Audio"></optgroup>
<option>Ac3 DVD - 192kbps Stereo (*.ac3)</option>
<option>Ac3 DVD - 384kbps Stereo (*.ac3)</option>
<option>MP3 (*.mp3)</option>
<option>MPEG4 Audio (*.m4a)</option>
<option>OGG (*.ogg)</option>
<option>Wav for CD (*.wav)</option>
<option>WMA (*.wma)</option>
<optgroup label="AVI"></optgroup>
<option>MS Compatible AVI (*.avi)</option>
<option>XviD FullScreen (*.avi)</option>
<option>XviD Widescreen (*.avi)</option>
<option>XviD Widescreen Anamorphic (*.avi)</option>
<optgroup label="Blackberry"></optgroup>
<option>Blackberry Curve Fullscreen (*.mp4)</option>
<option>Blackberry Curve Widescreen (*.mp4)</option>
<option>Blackberry Music (*.mp3)</option>
<option>Blackberry Video Fullscreen (*.mp4)</option>
<option>Blackberry Video Widescreen (*.mp4)</option>
<optgroup label="Bravia"></optgroup>
<option>Sony Bravia mpeg1 320x180 (*.mpg)</option>
<option>Sony Bravia mpeg1 320x240 (*.mpg)</option>
<option>Sony Bravia mpeg1 640x360 (*.mpg)</option>
<option>Sony Bravia mpeg1 640x480 (*.mpg)</option>
<optgroup label="Creative Zen"></optgroup>
<option>Zen Fullscreen (*.avi)</option>
<option>Zen Widescreen (*.avi)</option>
<optgroup label="DV"></optgroup>
<option>Raw DV for NTSC Fullscreen (*.dv)</option>
<option>Raw DV for PAL Fullscreen (*.dv)</option>
<optgroup label="DVD"></optgroup>
<option>NTSC DVD Fast (LQ) (*.mpg)</option>
<option>NTSC DVD Fullscreen (*.mpg)</option>
<option>NTSC DVD HQ Fullscreen (*.mpg)</option>
<option>NTSC DVD HQ Widescreen (*.mpg)</option>
<option>NTSC DVD Widescreen (*.mpg)</option>
<option>PAL DVD Fast (LQ) (*.mpg)</option>
<option>PAL DVD Fullscreen (*.mpg)</option>
<option>PAL DVD HQ Fullscreen (*.mpg)</option>
<option>PAL DVD HQ Widescreen (*.mpg)</option>
<option>PAL DVD Widescreen (*.mpg)</option>
<optgroup label="Google Android"></optgroup>
<option>Google Android Compatible Video (*.mp4)</option>
<option>Google Android Compatible Video Bitrate 480Kbps (*.mp4)</option>
<optgroup label="iTunes"></optgroup>
<option>iPhone, iPod Touch (*.mp4)</option>
<option>iPhone WideScreen (*.m4v)</option>
<option>iPod Nano (*.mp4)</option>
<option>iPod Small Converted to WideScreen (*.m4v)</option>
<option>iPod Small Fullscreen (*.m4v)</option>
<option>iPod Small WideScreen (*.m4v)</option>
<option>iPod Small WideScreen Anamorphic (*.m4v)</option>
<option>iPod TV Out Converted to Widescreen (*.m4v)</option>
<option>iPod TV Out Fullscreen (*.m4v)</option>
<option>iPod TV Out Widescreen (*.m4v)</option>
<option>iPod TV Out Widescreen Anamorphic (*.m4v)</option>
<optgroup label="LG"></optgroup>
<option>LG Chocolate (*.mp4)</option>
<optgroup label="Cell Phones "></optgroup>
<option>3GPP H.263 128x96 4:3 AAC mono (*.3gp)</option>
<option>3GPP H.263 176x144 16:9 crop AAC mono (*.3gp)</option>
<option>3GPP H.263 176x144 16:9 letterbox AAC mono (*.3gp)</option>
<option>3GPP H.263 176x144 4:3 AAC mono (*.3gp)</option>
<option>3GPP H.264 320x240 16:9 crop AAC stereo (*.3gp)</option>
<option>3GPP H.264 320x240 16:9 letterbox AAC stereo (*.3gp)</option>
<option>3GPP H.264 320x240 4:3 AAC stereo (*.3gp)</option>
<option>CDMA Phone Audio (3g2) (*.3g2)</option>
<option>MP3 (Mono) (*.mp3)</option>
<option>MP3 (Stereo) (*.mp3)</option>
<optgroup label="MPEG-4"></optgroup>
<option>MP4 Fullscreen (*.mp4)</option>
<option>MP4 Widescreen (*.mp4)</option>
<option>MPEG-4 H.264 video (high quality) (*.mp4)</option>
<option>MPEG-4 H.264 video (super high quality) (*.mp4)</option>
<option>MPEG-4 H.264 video (very high quality) (*.mp4)</option>
<optgroup label="Neuros OSD"></optgroup>
<option>Neuros HQ NTSC Fullscreen (*.mp4)</option>
<option>Neuros HQ NTSC Widescreen (*.mp4)</option>
<option>Neuros HQ PAL Fullscreen (*.mp4)</option>
<option>Neuros HQ PAL Widescreen (*.mp4)</option>
<option>Neuros Small File NTSC Fullscreen (*.mp4)</option>
<option>Neuros Small File NTSC Widescreen (*.mp4)</option>
<option>Neuros Small File PAL Fullscreen (*.mp4)</option>
<option>Neuros Small File PAL Widescreen (*.mp4)</option>
<optgroup label="Nokia"></optgroup>
<option>Nokia N810 mplayer 16:9 (*.avi)</option>
<option>Nokia N810 mplayer 4:3 (*.avi)</option>
<option>Nokia N810 mplayer CinemaScope 24:10 (*.avi)</option>
<option>Nokia Nxx Video FullScreen (*.mp4)</option>
<option>Nokia Nxx Video WideScreen (*.mp4)</option>
<optgroup label="Palm"></optgroup>
<option>Palm Fullscreen (*.mp4)</option>
<option>Palm Widescreen (*.mp4)</option>
<optgroup label="PS3"></optgroup>
<option>PS3 720p Fullscreen (*.mp4)</option>
<option>PS3 720p Widescreen (*.mp4)</option>
<optgroup label="PSP"></optgroup>
<option>PSP Fullscreen (*.mp4)</option>
<option>PSP Widescreen (*.mp4)</option>
<optgroup label="QuickTime"></optgroup>
<option>QuickTime H.264 video (high quality) (*.mov)</option>
<option>QuickTime H.264 video (super high quality) (*.mov)</option>
<option>QuickTime H.264 video (very high quality) (*.mov)</option>
<option>Quicktime MOV (*.mov)</option>
<optgroup label="Rockbox"></optgroup>
<option>RB Apple iPod Nano Fullscreen (*.mpg)</option>
<option>RB Apple iPod Nano Widescreen (*.mpg)</option>
<option>RB Apple iPod Photo/Color Fullscreen (*.mpg)</option>
<option>RB Apple iPod Photo/Color Widescreen (*.mpg)</option>
<option>RB Apple iPod Video Fullscreen (*.mpg)</option>
<option>RB Apple iPod Video Widescreen (*.mpg)</option>
<option>RB Cowon iAudio X5 Fullscreen (*.mpg)</option>
<option>RB Cowon iAudio X5 Widescreen (*.mpg)</option>
<option>RB iRiver H10 20GB Fullscreen (*.mpg)</option>
<option>RB iRiver H10 20GB Widescreen (*.mpg)</option>
<option>RB iRiver H10 5/6GB Fullscreen (*.mpg)</option>
<option>RB iRiver H10 5/6GB Widescreen (*.mpg)</option>
<option>RB iRiver H300 Fullscreen (*.mpg)</option>
<option>RB iRiver H300 Widescreen (*.mpg)</option>
<option>RB Sandisk Sansa e200 Fullscreen (*.mpg)</option>
<option>RB Sandisk Sansa e200 Widescreen (*.mpg)</option>
<option>RB Toshiba Gigabeat F/X Fullscreen (*.mpg)</option>
<option>RB Toshiba Gigabeat F/X Widescreen (*.mpg)</option>
<optgroup label="Tuna-Vids"></optgroup>
<option>Tuna-vIDS (*.avi)</option>
<optgroup label="VCD"></optgroup>
<option>NTSC VCD (HQ) (*.mpg)</option>
<option>PAL VCD (HQ) (*.mpg)</option>
<optgroup label="Walkman"></optgroup>
<option>Xvid walkman (4:3) (*.mp4)</option>
<optgroup label="Websites"></optgroup>
<option>Flash Video for Web use Fullscreen (*.flv)</option>
<option>Flash Video for Web use Widescreen (*.flv)</option>
<optgroup label="WMV"></optgroup>
<option>Power Point (*.wmv)</option>
<option>WMV for Web Use (*.wmv)</option>
<option>WMV2 Generic (*.wmv)</option>
<option>Xbox 360 (*.wmv)</option>
<option>Zune (*.wmv)</option>
</select>
Pero gracias por todo...
un saludo!