Yes, this File Browser is awsome that's why I started this thread. Install XAP file inside phone + can view STORAGE CARD folder which is the small FAT16 partition where I can copy files in my PC and so files from this partition copy from File Browser to inside Windows Phone Storage and reverse.
Now I will buy bigger microSD card and I will try to extend this small partition if it will work then I will be very happy.
Shame that this File Browser:
1. can't by tied with email client so you can post some file if you want
2. can't connect to Skydrive and copy files between Skydrive and device