I just updated the release to GROG 2.7b. Please download this new version and give it a go!

• Fixed "Parameter format not correct" errors on DOS 5.x - 6.x by removing unnecessary quotes from generated batch commands.
• Fixed "Garbage Data" in batch files on DOS 5.x - 6.x. The launcher now intelligently detects the OS version and skips incompatible DOS 7.x API calls that were causing memory leaks into the script.
• The launcher now generates a `_RUN.BAK` file alongside the standard launch script. This backup persists after the game exits, allowing you to inspect exactly what commands were sent to DOS.

Download: https://codeberg.org/jjmarcos/grog/releases

I did some quick testing using MS-DOS 5.00 running in a QEMU emulated machine, and the modifications seem to have worked!
@Boohyaka, if you still see any issues take a look at the _run.bak file to see exactly what tried to launch. Let me know your findings!

Shagittarius wrote on 2026-02-01, 20:02:

I use 7.1 as well so I never noticed that either. Glad to people checking it out, I never know how my configs might change in the future!
So I've been using it for quite a while and I only have one issue and a bunch of suggestions:
[...]

As always, I appreciate the feedback! I didn't have the time today and I'll be quite busy next week, but hopefully I can dedicate some time to go through your suggestions soon. Keep the them coming!

kahuna wrote on 2026-02-01, 19:24:

Hi @Boohyaka, […]
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Hi @Boohyaka,

Thanks for the bug report!
It looks like GROG was being too 'protective' with the generated batch file. The launcher was wrapping all paths in quotes (e.g., CD "C:\GROGMENU") to handle spaces. However, since you are likely running this on MS DOS 6.x, the command interpreter does not support quotes in CD commands. This is the reason for the 'Parameter format not correct' error.
Apologies for that! My dev and test machines run Windows 98, so the behavior is a little different there.

It should be an easy fix. A patched version will be available today.

It really helps to test the software on different machines! Really appreciate it!

I'm on DOS6.22 indeed and sweet! 2.7b works fine 😀 good job on the quick fix!
And please don't apologize - all thanks and credit goes to you for making cool free software for us to enjoy!

Appreciate it and glad that is working now @Boohyaka !

Just a heads-up to the thread: 'Real Life' has gotten busy (focusing on some career stuff), so I won't be able to work on new features for GROG for the immediate future. It might be a couple of weeks, or a bit more, before I can dive back in.
However, I’m not disappearing! If there are any bug reports, I'll still make time to fix them as soon as I can.

Thanks all!