Description is a sandbox settings in Sandboxie Ini. It specifies free text, which can explain, for example, the purpose of the sandbox.
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[DefaultBoxBox]
Description=Example<BR>text.
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[PrivateBox]
Description=Access denied to sensitive file locations
ClosedFilePath=%Personal%
ClosedFilePath=D:\MyDocs
The <BR> sequence in the text is used to indicate a line break. The free text is displayed in a balloon pop-up in the Run Sandboxed sandbox selection dialog box.