The Steel Guitar Forum

I play My rendered BIAB video (avi) in windows 10 media player and for some reason it becomes a (BT1) and then Media player won't recognize it. I can't restore it and I can't find any other program that will play it.
My first question is why would Media player do such a dirty trick?
My second question is how do I resolve the dirty trick?

Doing a search for bt1 file I come up with many hits that suggest malware infection.
Do a complete antivirus scan and also a malware scan with Malwarebytes, in case you have malware.

thanks Jack it only happens in windows Media player. I'm going to uninstall and delete all BT1 files.

Stuart,

Do you have Band-in-a-Box? Band-in-a-Box uses bt1 files.

yes I have BIAB they are BIAB videos. However they save on my PC as an AVI until I play them in Windows Media Player and then they become BT1. That would be OK if I could find something that would play a BT1.
I now render the videos from BIAB and then use VLC Media Player for all avi and I have no problems but VlC won't recognize BT1. So I'm shiiit out of luck on my previous BIAB videos.