Use the ARG_TYPE field to specify the data types for which the action is valid. Use the data attribute name.
You can enter a list of data types; separate the entries with commas.
For example, the following action definition assumes a GIF data type has been created.
ACTION Open_Gif
{
TYPE COMMAND
LABEL "Display Gif"
WINDOW_TYPE NO_STDIO
ARG_TYPE Gif
ICON xgif
DESCRIPTION Displays gif files
EXEC_STRING xgif
}