Context menu:

.  Open file (view / open dir)
.  Download
.  Download as tarball
.  File type & info (stat, file, arch, xattrs)
.  Filesystem used & free
.  Disk space usage
.  Block device info (size, UUID, label, ...)
.  Checksum
x  Device checksum (slow?)
.  Directory listing (find0)
.  Inspection data
?  LV information
?  Ext2 superblock info (tune2fs)

Display Windows Registry as a separate tree.

The slave thread should not have to remount filesystems.
If the mount points are the same as the previous command, it
should cache them.

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