I have seen an example of what i intend to do from this question uploading documents to sql server i have this working fine, but how would you upload an .mpp file? What would be the type be for it I have been searching for a while but can't seem to find anything.
As detailed here, you can see a few different MIME types that could be used. The following is that list:
application/vnd.ms-project, application/msproj, application/msproject, application/x-msproject, application/x-ms-project, application/x-dos_ms_project, application/mpp, zz-application/zz-winassoc-mpp
NOTE: "MIME type for [File Extension]" is a good phrase to use when searching for these things