In order to convert a stack to HyperCard 2.x format, open the stack, choose
the Convert Stack... item, and click OK in the confirmation dialog box.
NOTE: Once the stack is converted to HyperCard 2.x format, it can no longer
be opened by earlier versions of HyperCard without using third party
utilities.
Before converting a stack, keep in mind that you can always save a copy of
it by choosing Save A Copy... from the File menu. Because the copy is an
exact duplicate of the current stack, you can use Save A Copy... to archive
versions of your stacks in the old format or any other.
Most operations on stacks, such as entering text into fields, creating new
buttons, or editing graphics, are not allowed until the stack is converted.
When you attempt to perform such operations within a stack in the old
format, a dialog box appears informing you that you must first convert the
stack before performing the operation.
Cards from converted stacks do not retain their background ID number the
first time they are copied. Original 2.0 stacks are not a problem.
This article is adapted from the Claris Tech Info database.