Make Update and Update are a set of applications to update an older version of 
a file (or files) to a newer version.  They work by finding just the differences 
between the two versions and applying those differences to the older version.

This is especially useful when you need to maintain common versions of large 
files at remote locations and the differences between the two versions is small.  
Another use is to "patch" files or applications -- that is, to provide updates 
of files (e.g., applications) to current users without making the contents of 
the entire files available others.

A compiler directive ensures that the 16-bit and 32-bit versions create and use
compatible "Update Files" at the cost of a slightly larger file.

To compile under D1, I think the *.DFM files will have to be manually edited to 
remove extra properties that D4 added to some of the standard components. Attempt 
to compile "as is" to determine which are the offending properties.