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sinol100: Required files can be extracted from RTZ.GOG by using 7zip or any similar unpacker. RTZ.GOG contains standard iso-file, which can be unpacked with 7zip as well. Dosbox is not required.
Thanks, that actually helped me get Open Season running properly in SCUMMVM.
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StingingVelvet: It seems the GOG version is not compatible. Any way to make it so?
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Gabelvampir: The GOG version is compatible, but it is a bit tricky to extract the data files. At least I could mount/open the Image of the CD (RTZ.gog) with anything besides DOSBox. So here is what I did to make it run in ScummVM:

1) Open the dosboxRTZ.conf file in the Return to Zork install directory with a text editor. Scroll all the way down to the [autoexec] section. Deactivate all lines after "imgmount d "rtz.inst" -t iso" by writing a # at the start of the line.

2) Right click on the Return to Zork shortcut and select properties. in the target field delete everything after "-conf dosboxRTZ.conf". If you you want to keep the GOG version maybe copy the shortcut to somewhere and edit the copy.

3) Execute the shortcut. You should have a nice DOS prompt now. You need to type in and execute the following commands now (the lines starting with # are my comments what the command does and should not be typed):
mkdir c:\temp
# creates out dump directory in the RtZ folder
d:
# switch to the mounted CD image
copy RTZCD.* c:\temp
# DOSBox froze up for me for a few minutes at this command, it seems it is not build for copying
copy *.pmv c:\temp
# those 2 commands copy all the files we need from the CD Image to the dump directory

You can close the DOSBox window by typing exit or by clicking on the close button (if it is not fullscreen)

4) Copy all the files from PATH\TO\RTZ\TEMP to a new folder, whereever you want to put your ScummVM game datafiles.

5) Copy the ripped Music files from the GOG directory (folder Music) to that new directory. You need to rename them so ScummVM recognizes the tracks. ScummVM wants the files to be named track#.ogg. And they start at 1, but GOG numbered them after the track number on the CD. So you need to decrease the number by 1.
So i.e. the first track rtz_02.ogg should be renamed track1.ogg (no leading zeros).
Rename the other tracks in that fashion, like
rtz_03.ogg -> track2.ogg
rtz_04.ogg -> track3.ogg
and so on.

Now you can add your new folder to ScummVM via the main menu screen and all should work. I could not test the music yet I think my renaming should be right, according to the ScummVM docu.

If you can find a way to mount the CD image files (RTZ.inst seems to be a kind of description file for the image for DOSBox) you could save you the whole DOS prompt trouble, but that worked for my quick try.
Please post back if it worked for you or not.
10 years later and I had to use this to extract the files which is all that is needed to do to get the game to run in ScummVM. 7zip was not able to open the file for me as was suggested.

Thanks a decade later!
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rhindle: 10 years later and I had to use this to extract the files which is all that is needed to do to get the game to run in ScummVM. 7zip was not able to open the file for me as was suggested.

Thanks a decade later!
Well, you're welcome.
Thanks to you I just discovered this threat is linked on the ScummVM Wiki page for Return for Zork, so that probably makes it the most helpful thing I wrote on the Internet so far. Some Scumm games now support disk images in ScummVM, so hopefully it's only a matter of time until extraction is not needed any more. Or maybe GOG will start using ScummVM.
Although information provided in this topic was extremely useful I must inform everyone that suggestions herein how to extract iso from RTZ.gog via dosbox does not work with last available offline GOG version of the game (I could not mount c:\temp in dosbox no matter what I tried).

However I managed to extract iso file by using 7-zip but only after upgrading standard 7-zip application with Iso7z plugin that you can find in the forum herein by following next link:

https://www.gog.com/forum/lands_of_lore_series/loading_lands_of_lore_1_in_scummvm

After extracting the iso file from RTZ.gog just use 7-zip again on the iso file to extract all the contents contained in the iso file itself and next thing required is to copy and rename music files from GOG DOSbox version as explained in the original post by Gabelvampir.

Happy playing Return to Zork in ScummVM :)

p.s. I hope GOG will soon upgrade both Return to Zork and Lands of Lore to ScummVM version.
I can't get ANY of these solutions to work. I must be missing a step.

I cannot get any kind of 7zip program to unpack the .gog file.

There IS no way to use dosbox to do that either - not since recent changes.

How do I get this to work with ScummVM?

I have an original CD of RTZ (two versions that is), but I have no CD player.
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dalbozofgurth: I can't get ANY of these solutions to work. I must be missing a step.

I cannot get any kind of 7zip program to unpack the .gog file.

There IS no way to use dosbox to do that either - not since recent changes.

How do I get this to work with ScummVM?

I have an original CD of RTZ (two versions that is), but I have no CD player.
I used the "Portable WinCDEmu" program listed in the above post to gain access to the data files.
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dalbozofgurth: I can't get ANY of these solutions to work. I must be missing a step.

I cannot get any kind of 7zip program to unpack the .gog file.

There IS no way to use dosbox to do that either - not since recent changes.

How do I get this to work with ScummVM?

I have an original CD of RTZ (two versions that is), but I have no CD player.
Hello,

just tried my original instructions, they still seem to work for me, although it is still a bit tedious. Haven't looked into that 7zip plugin.
What is your problem when trying the DOSBox instructions, you don't get a DOS command line window? Have you edited you shortcut?
I just tried the GOG release with the newly released ScummVM 2.8.0, it now works with the GOG files out of the box, no extraction necessary!
I'm not sure if that is new for 2.8.0, but it must be a relatively recent feature for RtZ.
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dalbozofgurth: I can't get ANY of these solutions to work. I must be missing a step.

I cannot get any kind of 7zip program to unpack the .gog file.

There IS no way to use dosbox to do that either - not since recent changes.

How do I get this to work with ScummVM?

I have an original CD of RTZ (two versions that is), but I have no CD player.
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Gabelvampir: Hello,

just tried my original instructions, they still seem to work for me, although it is still a bit tedious. Haven't looked into that 7zip plugin.
What is your problem when trying the DOSBox instructions, you don't get a DOS command line window? Have you edited you shortcut?
https://www.gog.com/forum/zork_series/return_to_zork_reelmagic_support_in_dosboxstaging