Hi JackLRJohnson
1. about your issue
A) download the file This.bi attached at this answer and put it in QB64 folder
B)CPR this code
can you duplicate your experience?
see screenshot
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[ You are not allowed to view this attachment ]
Well in screenshot there are instructions about how to use QB64 Ide to manage included files into your code.
Be sure that the path of include file is right! Following your words it is so because the feedback of IDE is an error in include file and not File not found. So you have two way to solve your issue
1. rem the rem line with $include: again, in this manner you cut out the included file, if it doesn't matter
REM REM $INCLUDE:'this.BI'
or
'REM $INCLUDE:'this.BI'
2. open the included file and work in it to see what kind of problem there is ... (often it is a duplicate of name of something like variables, costants, label, functions, subs) In your case it seems about the rules to do a name in QB64 see here info
http://qb64.org/wiki/VariablePS about posting... it is just since a time that I don't use more Mozilla but it worked well....
I can sure you that both Chrome, both Edge, both Explorer and Opera work fine.