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Or you could get an old matching version of WebTrends for not very much money and have its calendar point to the downloaded folders, because they'll be pre-arranged the way WebTrends needs them to be. Sounds like they're using an old Log Analyzer version.
However, and I'm not being sarcastic, $100 paid to the hosting company would allow them to buy a really big hard disk for your account that would hold all reports for the next 50 years or so. Hard disk space is so cheap, and those WT report files are small.
Unfortunately, Interland is not being very helpful. The tech support supervisor I spoke with referred to the files and folders as "log files". These are files created in a directory named "reports" (Again, thousands of HTML files and hundreds of folders).
The HTML files do not seem to have any obvious directory file, so designing an HTML page to sort it all out seems impossible, if not simply impractical in this case. No single page that I have found shows anything of importance.
When I suggested the hard drive idea, the guy laughed and basically told me that large companies like them will not just stop deleting the reports, although they would gladly sell more server space. At least he was honest.
What do most companies do in a case where their site is hosted externally on a shared server and want to view annual webstats and create reports?
However interland almost always gives access to some of your actual raw log data, but they do not like to volunteer that information.
I would recommend contacting interland support again and requesting access to the raw log data so you can download it and run your own reports using WebTrends or any other analytics software you desire. This is what most companies and individuals in your situation normally end up doing.