File GUIDs in MSI changed when new files were added
I have been using an IDT file to populate the DuplicateFile table of our installer for a long time now. I decided to use it since i noticed that the GUIDs for the files in the File table of the MSI are the same on every setup project build.
Just this week, my teammate added new files which is part of our Web project output in our installer. After building our installer, to my surprise, the duplicate files were not copied to their destination folders. I later found out that the File GUID's of the generated MSI installer were changed. I have no idea how or where these GUIDs are generated but i think the addition of new files to the MSI prompted for the regeneration.