Quake 2 Demo Error

I added the Quake 2 demo to my thumb drive by copying the Quake 2 Demo folder onto my thumb drive into the PortableApps folder. Everytime I try and launch the game from the Portable Apps Menu, I receive the following error: "Could'nt load pics/colormap.pcx". The weird thing is if I actually go to the folder and launch the exe this way, it works. I tried creating 2 different exe files (created a batch and converted it to exe) that would then load the Quake 2 exe instead of the Portable Apps Menu actually loading it. This worked once, but when I ejected the thumb drive and stuck it back it, it didn't work anymore. Here are the batch file commands I used when I created the 2 exe files that would then load the Quake 2 exe (the solid lines seperate the two batch files...didn't want to use quatation marks since they might be confusing):

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START quake2.exe
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@echo off

echo Launching Quake 2 Demo

cd .\Quake2\

..\..\PortableApps\Quake2\quake2.exe

REM Tell the user that the game has exited

echo Quake 2 Demo as exited
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Both work perfectly as batch files and exe files, but I receive the following error when trying to launch the "START quake2.exe" exe from the Portable Apps Menu:

"Windos cannot find 'quake2.exe'. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search."

I receive the following error when launching the other exe file:

"Couldn't load pics/colormap.pcx"

I know my batch files are very crude. I just want to know how to launch the Quake 2 demo from the Portable Apps Menu (figured It would be great to be able to do this for all th future application I add to my thumbdrive like this that have trouble).

PS. Sorry if this is in the wrong section, I don't really know what this should be classified as since it deals with the Portable Apps Menu and another application not really supported for this use.