Isn't possible.

well, is there any way I can access files that aren't in an image from within boot? 😖

Not in official DOSBox.

this is a longshot, but is there a program that I could use to create a virtual image(heh) of a real folder/drive? Like, I could mount an image and it'd redirect to a real physical drive?

I don't even know what I'd google for. =/

What do you want to do?
If you got a fat16 image you can use imgmount to transfer files from/to
the image before booting from it.

I have a folder on my C drive(NTFS), and I wish to mount it as a Fat16 image within DOSBOX's boot command.

As already noticed mounting "folders" doesn't work under msdos (go bug
microsoft if you don't like it), so what do you want to do? Are you sure that
transferring files before booting into msdos isn't enough? Why do you need
into msdos at all?

I actually have Windows 98 installed in it, and dosbox on my PSP, I'd like to be able to stream programs from my desktop.

Windows 98 requires MS Dos.

Also, would the JOIN command be any help(if I can find it?)

It mounts a drive/folder as another folder on another drive in MS DOS.

Well copy the "programs from your desktop" to your disk image. Doesn't sound
like you need permanent access to the folder anyways.

You can use WinImage to modyfy your disk image before mounting it

win98 not supported.
*closed*