QFG 1 Original is located in the directory: QG1OLD. To play the game, type: qg1old [enter], to run the .bat file.
QFG1 Remake is located in the directory: QFG1NEW. To play the game, type: qg1new [enter], to run the .bat file.
QFG2 is located in the directory: QG2. To play the game, type: qg2 [enter],to run the .bat file.
QFG3 (English version) is located in the directory: QFG3E. To play the game, type: qg3e [enter], to run the .bat file.
QFG4 (CD version) is located in the directory: QG4CD. The .bat file is also located in the main QFG Collection directory (C:\Sierra\QGANTH, by default), so you can run the file from there, without having to change to the game directory. Type: qg4cd [enter], to run the .bat file.
Enjoy the games :)