[MTUSUPPORT]

From what you have told us in this last post

Keyrite Click select input file = C:\songlist folder pops up but is empty. But if you select wave files C:\songlist folder pops and the tracks are there

You have imported your files as .wav files, not .cdg files.

Go back to Microstudio, and Import your files in as .cdg. If this is what they were supposed to be imported as.
Micro Studio
Play Click add track = C:\songlist folder pops up but is empty. MTUSUPPORT ADDED: This will only show .cdg files. If you imported as a .wav file, it will not show here.

Play Click select folder = C:\songlist folder pops up but is empty.MTUSUPPORT ADDED: This will not show any files. It only allows you to select the Directory to save the files in.

Duplicate Disc Click select folder = C:\songlist folder pops up but is empty.MTUSUPPORT ADDED: This will not show any files. It only allows you to select the Directory to save the files in.

Custom Assembly Click select folder = C:\songlist folder pops up but is empty. MTUSUPPORT ADDED: This will only show .cdg files. If you imported as a .wav file, it will not show here.

Custom Assembly Click add track from hard drive=C:\songlist folder pops up but is empty. MTUSUPPORT ADDED: This will only show .cdg files. If you imported as a .wav file, it will not show here. Unless you have Audio CD selected as the Disc Format. Then you should see these files that you have imported.

KHP Click add music = C:\songlist folder pops up and the tracks are there.MTUSUPPORT ADDED: This will only show .wav files. This is why you see the files here.

Vogon Click select output file=C:\songlist floder pops up & the tracks are there.MTUSUPPORT ADDED: This will only show .wav files. This is why you see the files here.

Keyrite Click select input file = C:\songlist folder pops up but is empty. But if you select wave files C:\songlist folder pops and the tracks are there. MTUSUPPORT ADDED: This will only show .cdg files, when the Files of Type is set to .cdg. If you imported as a .wav file, it will not show here, unless you change the Files of Type to .wav.