Important Privacy Reminder: Nobody but you will have access to your Box files. Million File Editor runs from the computer(s) you personally install it on. It needs access to your Box custom app so that you can use it to replace text in files.
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Million File Editor and Box get along great.
Here is a brief overview of the simple steps you need to perform (described in detail in the knowledge base article linked above):
1. Have Box Support enable the “Developer” add-on in your Box account. This way Box will let you create a custom Box “app” which you will use to connect Box to Million File Editor.
2. Create a custom “app” in Box. This is the way to connect Box with Million File Editor. A custom app in Box is really just a connector with a few settings. You can create one in about five minutes.
3. Enable two-factor authentication in Box. This results in an increase in your custom Box app's security. Box requires you to do this before it will provide you with the Client Secret, which you will use to connect Million File Editor to your custom Box app.
4. Ask Box Support to set give your custom Box app the Global Content Manager (GCM) scope. Box Support usually gets this done the same day you request it.
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Note: If you ever create a different custom Box app for use with Million File Editor, you have to get Box Support to give that new app GCM scope. This scope is per-app, not per-enterprise. This is how Box works.
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5. Set up a connection to that Box app in “Network Locations” in Million File Editor by pressing {Add…} → Box... That window is called “Configure Box”. This is also super easy. It just takes a couple minutes.
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Once you’ve successfully performed the steps above, you will be able to run Million File Editor on your Box files.