Apart from hiding files inside BMP image files, converting files for allowing them to be sent as email attachments, BMP Wrap is also used to encrypt files.

Resetting Android Permissions When you open a particular file type on Android, such as BMP, you're given a menu offering a choice of compatible apps with which to open it.

Free software that extracts icon picture of such design you like and can save it in ICO / PNG / BMP format is hereIconViewer".