I am looking for information on the file type BMPp. Namely I need an application that can create this file type, preferably open source or free.

Wikipedia says for BMP File Format that 'BMPp' is a "type code", which is the "mechanism used by pre-OSX Macs ... to denote a files format..." (Look in the little info-box of general information under "Type code"). Continuing my research, I found an old 2009 archived mailing list "Re: Incorrect png file type 'PNG' that talks about something related to another problem a developer is having. In the response he talks about there being variant file types, and lists BMPp as being linked to an old version of Graphics Converter. The company Lemkesoft sells Graphics Converter, which I am not willing to purchase.

I can't imagine that the only program in existence to make a BMPp file is that program. There has got to be another way to make that file type, other than creating a BMP file and just renaming it to BMPp (unless of course it is really that easy)?

This is the first time I've run into this file format, and it took a bit on Google, Bing, and Wikipedia to find the information that I've posted here. Any further help would be appreciated.