Force Box Docs

ForceBoxDocs is a global setting in Sandboxie Ini (introduced in v1.17.0 / 5.72.0). When enabled, if a program is started outside Sandboxie with a file path argument and that file is located in a sandbox, Sandboxie automatically starts the program in that same sandbox.

Usage:

   [GlobalSettings]
   ForceBoxDocs=y

How this setting is evaluated:

It applies only when a process starts unsandboxed; if the process is already started sandboxed, this setting is not used.
It checks the parsed file path/document argument from the command line.
Sandboxie ignores leading command-line switches (options starting with - or /, such as /n or -Embedding) to correctly identify the target file path.
The file path/document argument check is skipped when the process being evaluated is Sandboxie's own Start.exe.
Only boxes enabled for the current user/session are considered.
Boxes with DisableForceRules are skipped.

This setting is useful when users open documents directly from boxed paths and you want the associated application to automatically start in the correct sandbox.

Command-line examples:

"C:\Program Files\Microsoft Office\root\Office16\WINWORD.EXE" /n /dde "C:\Sandbox\Alice\DefaultBox\drive\C\Docs\Report.docx"

Result: the file path points to DefaultBox, so the process is forced into DefaultBox.

"C:\Windows\System32\notepad.exe" "C:\Users\Alice\Desktop\Notes.txt"

Result: the file path is not inside a sandbox path, so ForceBoxDocs does not force the process.