I use the standard Microchip MPLAB edit/compile environment Version 3.31. As I prefer writing code in lower case and reserving upper case for certain global constants, etc, I have added the "/c-" command line flag to the MPASMWIN compiler options. If you use my code as is, you will need to do the same. The dialog box is reached from the MPLAB main window by clicking on Project then on Add/Modify Compiler. Make sure the MPASM for Windows compiler name is selected and add to the Extra Default Options edit box the flag /c-. This edit box should now contain the line
/q /c-
This tells the assembler to ignore case.