How to Enable Plugin before File Opened And Load PDF File From memory?

hello everyone,
there have two problems,all i want to do is to show a pdf file encrypted by AES algorithm.
1.one is how to enable plugin before file opened?
i developed another two plugin,and each enabled after one pdf file was opened,and now i want to replace the file open command and can do some word by meself,such as decrypt the pdf ?
2.another is how to load pdf file from memory?
if i can enable plugin before file opened,and than i can read the file and decrypt it,and now i want to do is do load the decrypt file (in memory) into the adobe?
i tried many method,but all in vain.who can help me or give me some advice?
thanks.
merry chrismas to everyone.

The proper way to handle other file formats (even where it is really a PDF that has been "wrapped") is to create an AVConversionHandler.
To load a PDF from a source other than the file system, you need to create a custom AVFileSys.

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