How to handle file open from browser NPAPI plugin?

I need full path to file when file is opened. For exampl开发者_如何学JAVAe user open file.txt but it will be opened with notepad or other. But how to register "hook" from NPAPI plugin to get path to file and prevent opening in other program?

An NPAPI plugin doesn't sound like it's at all the right technology for what you want to do. Plugins are for running native in the context of a specific web page, whereas it sounds like you just want a local application that's registered with the OS as the handler of certain file types.