Found the reason why my Dreamweaver's "Preview in Firefox" wasn't working

In some of the Dreamweaver forums, there were some users whose "Preview in [Browser]" suddenly wasn't working. I had that same issue, but I did some experimenting, and I found out why—at least in my case—why a particular html file, when opened in my Mac's Dreamweaver CS6, Version 12.0, wouldn't preview in my Firefox browser. I noticed that the filename contained a question mark. When I deleted that question mark from the filename and then opened that html file back into Dreamweaver, the "Preview in Firefox" worked fine. For a test, I closed the file, typed a question mark back into the filename, opened the file into Dreamweaver, and then that "Preview in Firefox," once again, didn't work. There may be additional characters in filenames—other than the question mark—that could cause problems with Dreamweaver's preview feature.

Rob Hecker2 wrote:
Ken, why do you say no numbers at the beginning of file names? That's true of variable names but not file names.
Thanks Rob -
I'm 80 years old, so I've probably got some ancient "best" practices in mind.
While this isn't absolutely required, some programming languages give numbers special notice, and so a file starting with a number might not be treated as a file.

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