Convert mht\pdf\excel and encoding

I am looking for a .net library that can help me do one of the following: 1. Convert an MHT file to PDF 2. Convert between pdf versions 3. Change a pdf file encoding 4. Convert an MHT to an Excel file 5. Convert a MIME version of excel (an Excel file that is readable via notepad) to a binary Excel file 6. Convert between Excel version

From stackoverflow

• Did you ever find a solution here? I am trying to convert MHT style documents to plain HTML or straight to PDF. Danged Microsoft and their non-standard standard.