[createi]

are there any file explorers in blackberry, without any restrictions?

[Perfect Storm]

As in view the OS file structure? No

[John Clark]

In the media app there is an "explore" feature for exploring all your media files and sd card files.

[pauldumais]

Idokorro Mobile File Manager is a File Explorer for BlackBerry. It will let you browse the entire file system of the BlackBerry devices as well as remote drives on your network like Windows Shares, Web Shares, FTP & SFTP servers.

You can download it over the air directly from your blackberry by opening mobile.idokorro.com in your blackberry browser.

[xhen]

I have found this one

Dollars 5 Complete » multiPlay Personal edition for Blackberry 8800 and 8100

[danbra]

eFile by Dynoplex. SD card access and files processing is supported.