Think it's the pesky internal zip program Skoda use, if you aren't using the latest 7zip to unzip or the Windows internal program with the right click then it doesn't unzip correctly.Well I never!
Uninstalled 7-Zip and reinstalled latest version. Downloaded nav file again and still no luck.
Tried it on a friend's Windoze 10 PC with same result!
Thought I'd give it a go on my Mac so downloaded the relevant programs and lo and behold it worked perfectly.
So looks like the pesky Windoze laptop can be confined to the bin as I don't use it for anything else.
Anyway, thanks for your help and assistance.
BTW
There is life in the old Windows 10 64 bit machines that aren't compliant with Windows 11 by installing Window 11 24h2 with the server command prompt. Older harder with non fancy drivers seem to cope well with the workaround. Got two 13 year old tower units happily on Windows 11 24h2. Newer compliant hardware does have some issue on the 24h2 update... still 25h2 to look forward to

Have a thread on that.
Windows 11 22H2/23H2/24H2 Upgrade on unsupported 64bit hardware - link
It's that time again with Windows 11 unsupported hardware. The annual release is out 22H2 so to do it you have to do the workaround. This changed from the one I put up last year, although there are others which got you from Windows 10 to Windows 11. Last years link...

Still the good news is you have installed 25.06 map.
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