.BMX File Extension
File TypeSiemens Mobile Animations File
What is a BMX file?
Bitmap graphic used by some Siemens mobile phones; saves four bitmap images joined together vertically (e.g., four 16x16 pixel images as a 16x64 image); used for animating the four frames in sequencefor simple animations on the phone; similar to an animated .GIF, which is also supported on Siemens mobile phones.
Since BMX files use bitmap formatting, you can open them with a BMP viewer.