If you add a date (for example, DrawnDate), as a property, the software does not require
you to enter a date for Value /
Expression. However, if you do not enter a date, Microsoft
interprets the empty field as 1/1/1800 when you view the document's
properties in File Explorer.
Use an @ sign in front of single or double quotation marks (‘
or “) to ensure that the expression evaluates correctly. For example:
2@" X 2@" X 1/4@".
The @ sign also applies when referencing a Property Name that includes a quotation
mark. For example, if you have a file property whose name is Length12”, you must add an @ sign in Value/Text Expression for that property.