I don't think this is the case. I ran a search on my website for references to the invalid files, and the only references that appeared were those in the Sitemap at [ External links are visible to forum administrators only ]
e.g. Site map shows this entry:
[ External links are visible to forum administrators only ]
But this file does not exist on my site that I can see using FTP program, nor can you find BT530_DS.pdf upon a site search (except for the sitemap entry), so I don't believe it is a broken link.
So I ran this test. I added code to create a link to a non existant .pdf file.
<a href="Images/V158_DA-10_125x.pdf" target="_blank">Test no file</a></p>
to this page (near bottom of page)
[ External links are visible to forum administrators only ]
Then ran the Sitemap generator. It did not create a false V158_DA-10_125x.pdf entry in the site map. Note there is a false link in the site map to another file I deleted recently
[ External links are visible to forum administrators only ]
So this is not an isolated problem.
Also, the free version of the sitemap generator used to provide messages upon detection of broken links, and I paid for that service at one point (more than a year ago). I'd purchase this feature again if available as it is very useful. Even the free version used to provide Broken Link alerts for one item at a time, which helped. Now I can't trust the program at all to advise me of broken links.
I have contacted the site hosting company to see if there might be an older version of my site files in memory somewhere, but they claim not.
Can you suggest anything else, or perhaps help me frame the right questions to the web host support. Somehow I think the problem is there.
Thanks
Stu Cox