It looks like that several graphics editors support saving to Subspace/Continuum bitmap graphics (.bm2) so nothing should prevent you from saving .png files (Portable Network Graphics) to .bm2. Some programs known to be capable of png to bm2 conversion are listed below.
Convert Portable Network Graphic to Subspace/Continuum bitmap graphic.
We found 4 software records in the database related to .png to .bm2 file format conversion.
Microsoft Windows software - convert png to bm2 on Windows
One of the best bitmap graphic editing program
Convert from png file format
|Yes, Adobe Photoshop supports png file conversion as a source file type.||Yes||Yes||png editor||Yes||Yes||Yes||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned png to bm2. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A professional photo editor and manager for Windows
A set of applications used by professional graphic designers
Apple macOS / Mac OS X software - convert png to bm2 on OS X
Mac version of popular digital image editor