You can lock out files in netViz by following the standard method via the OS
C:\Documents and Settings\lockmyfile>attrib /? ( lockmyfile as an example).
Displays or changes file attributes.
ATTRIB [+R - -R] [+A - -A ] [+S - -S] [+H - -H] [drive:][path][filename] [/S [/D]]
+ Sets an attribute.
- Clears an attribute.
R Read-only file attribute.
A Archive file attribute.
S System file attribute.
H Hidden file attribute.
Specifies a file or files for attrib to process.
/S Processes matching files in the current folder
and all subfolders.
/D Processes folders as well.
By setting the attrib to read only as seen below:
ATTRIB +R [drive:][path]filename
The result from the above will produce a read-only file.
We have no other method to lock a file at this time.