Adobe's "PDF Open Parameters" describes / discusses what Almir spoke to.
See:
http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_open_parameters_v9.pdf
The open parameters have a limited command line use and are otherwise exclusive to use within a URI/URL.
Do note that both Microsoft and Adobe use the character "#" as a file related "parameter".
The usage / definition of this character is very differently setup by the two different software houses.
Just some Brownian movement of thought - Perhaps a recommendation to Microsoft to align with Adobe's usage would be appropriate?
Good to know -- Adobe's PDF Open Parameters have been in place since the Acrobat 3.x product family from back in the day (way back to the 90's).
Be well...