What Is Application Octet Stream
Octet-stream files are usually executable application files. If still having trouble opening a file, request that the sender attempt to retransmit the file. Email or web clients are rarely able to open octet stream files, but may be able to determine the appropriate program to open the file. I am using MultipartEntityBuilder to create Entity in java. MultipartEntityBuilder needs boundary value to be set. But dropbox is not - 292619.
Content Type Octet Stream
So you are getting application/octet-stream from querying QMimeDatabase? If so this just means that there couldn't be a related mime-type found.
What Is Application Octet Stream How To Open
So you want to convert a binary STL file to a ASCII-STL file and also render it's 3D model? Well this requires that you fully understand the binary structure of binary STL files in order to do the proper conversation and the proper interpretation. You are better off searching for a C/C++ library which does the work for you. Alternatively you may want to use a webservice to do so in your application. But i think i am not going too far when i say that doing this all on your own is illusionary, when you already asked this question.