Exposing the complete file system is potentially dangerous. I won't do that. People should organize their plugins, in that they put it in a folder, with everything needed externally along with it. Like in this example:
- tempsnip.png (5.98 KiB) Viewed 10685 times
The root folder would then be "99Sounds Drum Machine.instruments". Imagine, you'd enter "C:\" as root folder! My system does a
complete recursive file search everytime you click. I can't even imagine how long it would take to search through some 300,000 files in 200,000 folders to build the tree-list of your complete harddisk (let alone building the popup menu)!
If you are looking for a file browser, that already exists. It is a Windows control and shows up, whenever you want to open or save something (I think it is used, when triggering the dialog prim).
I can have a look however, as to why it isn't already possible to just show the names without extensions. I know for a fact, that I use Ruby's methods to split the filenames up.
EDIT: And you wouldn't even be able to set a full path. How would you know, where your user might have saved your plugin, or your patches, or your wave-files, etc. Or the user name of your user, in case he puts in user/documents.