You have to tell your program where to find assets - it doesn't magically know if you start renaming folders.
Create your executable in the same location as the source code. Use relative paths i.e. "Game\gfx" instead of "C:\Program Files\Blitz\another folder\my games\Game\gfx". That way your stuff will work through the IDE, and as an executable.
Create your executable in the same location as the source code. Use relative paths i.e. "Game\gfx" instead of "C:\Program Files\Blitz\another folder\my games\Game\gfx". That way your stuff will work through the IDE, and as an executable.