If I understand your French correctly, your "count objects" result is not saved in a BMP file. This is because the result is stored as an overlay, not in the original image. You can use "IMAQ Write Image and Vision Info" (Motion and Vision -> Vision Utilities -> Overlay) to save in a PNG file. The extra overlay information is then stored along with the image. Or, you can use "IMAQ Merge Overlay" to put your overlay into the image, and then save as BMP.
MArtin