Using dedicated programs like the Total GIS Converter, it should be quite possible to convert various GIS images like the LizardTech mrSID (*.sid) files to a common BMP format. It will be just a static picture without any metadata.
Convert LizardTech MrSID image file format to Standard Windows bitmap image.
We have found 2 software records in our database eligible for .sid to .bmp file format conversion.
Microsoft Windows software - convert sid to bmp on Windows
A converter that is able to transform various GIS file formats
Convert from sid file format
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 sid to bmp. 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 dedicated converter for SID format