The manufacturer is not BTC. The Card is a Video Capture card based on BT848 chip, and as I saw is a very requested driver on driver search forums.
The following files are found inside the driver download file.
|BT848_16.DLL||11.8 KB||20 Sep 1996|
|BT848_32.DLL||44.0 KB||20 Sep 1996|
|BTVVC.DRV||54.3 KB||20 Sep 1996|
|BT848.~DR||70.7 KB||30 Sep 1996|
|DDRAW16.DLL||23.0 KB||25 May 1996|
|BT848DLG.DLL||12.4 KB||9 Feb 1997|
|GRAPPLER.DLL||36.4 KB||20 Sep 1996|
|BT848.VXD||72.2 KB||20 Sep 1996|
|DDRAW.DLL||159.7 KB||29 May 1996|
|BT848DDI.DLL||37.4 KB||20 Sep 1996|
|BT848DLG.~DL||20.5 KB||20 Sep 1996|
|DDHELP.EXE||31.7 KB||22 May 1996|
|BT848.DRV||74.8 KB||13 Feb 1997|