Thanks for sharing this. But some comments about code.

• postconditionals is a very good part of our language, but here is too much, and quite difficult to read such code. In this case much better will be simple if else
• return in try block is a bad idea, you should throw an error, which will be caught anyway
• we can do new $namespace, but in your code, this method returns to wrong namespace, look at my previous point
• instead of $replace(database,"/","\"), use ##class(%File).NormalizeDirectory(database), in this case you should not check on OS, even you forgot some of OS's, and in this case NormalizeDirectory/NormalizeFilename, a bit better.
• verbose mode will be better to do with a macros, something like $$$DebugInfo("some message")
• In your code I see so many checks on errors, and looks like, after such error we should exit, but you go further. You should look at some system macroses like $$$ThrowOnError() and so on, I think you should use it. And code will much more clear for readers
• and at the end you have some call to method checkRW, I think you should remove it, or show this method, because it's not clear what it does

And, before publishing, please change tabs to spaces, because tabs here is too big. And width of lines should be a bit less, because read such long lines a bit difficult. 

I fixed tabs here, for more readability.

XLS, files much more difficult that plain CSV. And depends on which version you want. XLS - it is a binary format, but XLSX already bunch of XML files but compressed in one file.

You can try to use ZEN reports, which supports XLS as one of output formats.

There are lots of ways how to export data in CSV format in Caché. Add here your or code, or some more information. How you did it, and after that we may help.

You can use this link
https://community.intersystems.com/rss

Please add more details. What HTML report? And what the final goal, you have to achieve ?
Looks like you have to use %Net.HttpRequest, but I'm not sure, because of your description.

Please add some examples of code.

I'm just repeat my answer from google groups

This process names decompile, and it is quite difficult process, and may not be legal in some cases I think. 

I saw only one very old project, for version 5 or less.

And actually answer is yes, it is possible, but we don't have such tool now. To do it, you should know exactly how works compiler, and it's lots of work.

Your clarification does not help actually. But any way, deleting any object, leave just ID on a link, and again, everything here depends on your application. In most cases it could cause for some different issues, when application have not expected deleted object. And I would recommend to use some flag like "isDeleted", which can help to hide such objects in most of places, and still have an access to the content of this object, to show if it would be needed. Completely delete object recommended only in case when no any other objects has links to this one. 

It is completely depends on application which you use. Some developers create their own table for users independent from Caché users.

Or maybe you talking about  HealthShare or TrakCare?

While your code interrupted when server shutdown, you can't do it directly. But I think you can try to call restart service of cache. So you should look at possiblilties OS, which you use for this server.