How do i make the background for a BMP file, transparent?

I've been working on an icon for design reasons, and when i save the file as a .BMP, the background appears white. The file i work in has no background and it transparent, except for the icon of course. The dimensions of the icon are 32px by 32px. I can't upload the bitmap file onto this topic, apologies if that hinders anything,

Windows Bitmap – Wikipedia
32 bit-per-pixel BMP (mode ARGB )has a leading byte, which is used by Photoshop
as alpha-channel for variable transparency. That's not a part of the BMP specifications.
It should be avoided, IMHO.
The reason for the introduction years ago has been the faster access by 32 bit
registers (opposed to 24 bpp).
Best regards --Gernot Hoffmann

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