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Server support for SSI (Server Side Includes)
You can also create indexes by naming them index.shtml.
On the other hand, you should note that we do not allow execution of external software (IncludesNOEXEC is enabled).
It is not possible to use include file="" with a file that is in a different directory to that of the referring file.
If you really want to include the file from another directory, you must use include virtual=""
Link to this FAQ: