Guitar Harry:

When you perform the Associate File Types in BIAB, it changes some information in the Windows Registry so that any file with the following extensions will automatically open up in BIAB when they are double clicked in your File Explorer program.

Those possible extensions are as follows:

MG1 MG2 MG3 MG4 MG5 MG6 MG7 MG8 MG9 MGA MGB MGC MGD MGE MGF MGG MGH MGI MGJ MGK MGL MGM MGN MGO MGU MGX

SG1 SG2 SG3 SG4 SG5 SG6 SG7 SG8 SG9 SGA SGB SGC SGD SGE SGF SGG SGH SGI SGJ SGK SGL SGM SGN SGO SGU

These extension are all hold-overs from way back in BIAB's history and you will rarely see some of them used today.

As Video Track stated, they can be either be toggled on or off depending on your choice. I have a rather large collection of songs I have collected over the past 30+ years and many of them have odd extensions so I just keep them turned on by default.

If they are turned off and you happen to double click on a song file via File Explorer, Windows will not know what program to use to run the file and will let you know via a popup window each time until they are re-associated.

BIAB2024
Windows 10 Pro
WA6NCB