This compatibility fix intercepts all of the LZ API calls and either increments or decrements the handles so that a valid ...

This compatibility fix intercepts all of the LZ API calls and either increments or decrements the handles so that a valid handle (from the application's perspective) is always greater than 0 instead of greater than or equal to 0. This compatibility fix applies to applications that treat a handle value of zero as an error. Windows 9x never returned handles of zero, but this is a possibility on Windows XP.