Steganos LockNote - Norton SONAR false positive

Steganos LockNote is a free program which encrypts text files. Every time I use it, NIS 2010throws a hissy fit:

 

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On computer as of
12/17/2009 at 2:38:25 PM
Last Used:
12/17/2009 at 2:41:57 PM
Startup Item: No
Launched: Yes
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Very Few Users
Fewer than 10 users in the Norton Community have used this file.
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High
This file risk is high.
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Threat Details
SONAR Protection monitors for suspicious program activity on your computer.
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Origin

Downloaded from  Not Available
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URL Not Available
UNTESTED

Source
stg1f.tmp
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File Actions
File: c:\documents and settings\charles\local settings\temp\stg1f.tmp
Removed
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File Thumbprint:
Not Available
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I know how to override Norton's per-program settings to allow Internet access to specific programs, but how can I make Norton stop treating LockNote activity as a high-risk threat?