I wasn't able to reproduce a problem with this on Windows 10.
On which version of Windows do you have this problem? Do the .SAZ files still show the gray/green crate icon? Does double-clicking the file start Fiddler, or do nothing at all?
In RegEdit, what do you see inside HKEY_CLASSES_ROOT\Fiddler.ArchiveZip\Shell\Open\command
I wasn't able to reproduce a problem with this on Windows 10.
On which version of Windows do you have this problem? Do the .SAZ files still show the gray/green crate icon? Does double-clicking the file start Fiddler, or do nothing at all?
In RegEdit, what do you see inside HKEY_CLASSES_ROOT\Fiddler.ArchiveZip\Shell\Open\command