You really need to set up your own website for this purpose (or FTP site, which amounts to much the same thing). You can't rely on the likes of DriveHQ - not because of any perceived weakness in the service, but because you need full programmatic control over what you put there and how it is accessed. I wouldn't go for a free website either, for the same reasons.
Creating your own site needn't be difficult or expensive. Just browse some of the web hosting companies in your country, and look for a good deal - but also read the testimonials or reviews so that you can form an opinion of their service. The chances are that you'll only need a basic package, with no special features.
You mentioned users with different ISPs or in different countries. That's pretty irrelevant. By default, your site will be accessible to anyone who knows the URL. It doesn't make any difference where in the world they are.
Once you've got the site sorted, there are several ways in which you can arrange for users to pick up updated versions of your files. The easiest is simply to give them a URL of the file, and have them manually download it. But you would need to add some basic security restrictions to prevent unauthorised access. The chances are you'll need a more automated solution. If you're not sure how to program that, West Wind's Internet Tools would be worth a look (
I've also written an article which describes certain tools that I use for over-the-web updating in my own applications (
Another approach would be to use the Microsoft Internet Transfer Control that comes with VFP. This gives you programmatic access to any web site, either for downloading files or for performing a full range of FTP functions.
I hope this helps. My main message is that the whole process should be straightforward, and although you'll probably have to spend some money, it's not going to break the bank.
Mike
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Mike Lewis (Edinburgh, Scotland)
Visual FoxPro articles, tips and downloads