VolvoGirl, I'm afraid you are very wrong. The 8.3 limitation on file names went away in 1995. The article you linked to does not say you can't use a period in a file name as you claim. It does list a number of characters you can't include in a file name, and the list does not include a period.
You can verify this yourself by just trying it. Save a file in ANY Windows desktop application other than turbotax and include multiple dots in the file name. It will save just fine. And even turbotax will retain multiple dots in a filename, just not all of them. It will save 2024.FullReturn.zeblon.Final.pdf as 2024.FullReturn.zeblon.pdf. Multiple dots, just not all of them.
I'm a professional software engineer with 30+ years experience. Most of what I do is write desktop applications for Windows. I know the conventions.
I strongly suspect they have code to strip the extension from the file name so they can add the extension back on later. They apply this stripping logic twice. Not only that, they don't check if the extension they are stripping matches the extension they're going to re-add later in the process. Poor coding.
