SiteCenter can define certain file types to be handled as include files. An include file has to have a different extension from the editable files, like .inc.
The Include File Types are defined in the Admin area. To define them:
1. go to Account Plans / Manage Plans;
2. click Edit on the plan you want to add the include file types;
3. enter the extensions you want SiteCenter to handle as include files in the Include File Types text box. Use commas if you want to have more than one extension handled as included file;
4. click Save.

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