I had the same problem (When I drag the folder onto the HTML Article Packager, nothing happens) on Windows 8 64-bit until I copied all the files on USB key ( into G:\DPS_2015) to try on the different PC:
3 files from C:\Program Files (x86)\Adobe\ArticlePackager
HTML Article Packager shortcut from desktop.
Then for HTML Article Packager change properties "Target" and "Start in" to
Copy article's folder (e.g. blueArticle01) into G:\DPS_2015
And now drop that folder onto our new HTML Article Packager shortcut inside the G:\DPS_2015.
Say your prayers and look for the created file G:\DPS_2015\blueArticle01.article
Moved it to D\DPS_2015 and it still works.
You've got an idea, right?
Just would like to add that it also works in Windows 10 64-bit and that you may also edit the article-packager.bat file and change 1st line into "echo on" and add one last line "pause", so you may see the errors article-packager.exe is sending. When there is a bug you may see this error (at least I had it) in the output "Error: wrong number of arguments, 4".
It's a great tip to edit the .bat file, turn echo on and set a pause, so you can see the error(s). Using that technique, I was able to quickly see that my article's grandparent folder having spaces was causing an error. Once I renamed the folder, it worked as expected. Thanks!
a) - Have you checked the content of your main folder ?
In case, you have the HTML Article Packager on the desktop and the main folder on a different location, the resulting .article file will show up where the folder is located not on the desktop ;
b) - You can run a search on your computer as follows : thenameofyourfolder.article (let's say you folder is called test, then the search will be a test.article). Also you can use a wildcard search such as *.article
c)- Another approach you can make is to put the main folder in the same place as the HTML Article Packager (let's say on the desktop), in this way you will be certain that the article file will appear in the same location as the HTML Article tool