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%F indicates the edited PWAD file to be tested.
NOTE: Doom Builder writes everything to a temporary file, this is not the file
that was opened through the File -> Open Map dialog.

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%WP indicates the IWAD resource file to be used (path included).
This is the first (highest) IWAD file that is found in the resources list.

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%WF indicates the IWAD resource file to be used (without path).
This is the first (highest) IWAD file that is found in the resources list.

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%L indicates the map lump name as is set in the map options.

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%AP indicates the all resources files, except the first IWAD file (paths included).
The items are seperated by spaces. When used within quotes "%AP", the quotes are
also repeated for every item.

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