Tricky pixel scaling problem

[Skybird]

I need a solution to this problem:

There is a strategy game using hexfield maps and counters. It was designed for lower resolutions. Running it today on a 1680 screen, means that map and counters are zoomed out and become so small that it is no real joy to look at them. The screen is full, yes, but thre additonal space it offers is not used for displaying the screen-filling original display, but for showing more parts of the maps at the cost of making everything much smaller.

Wanted: an application that allows a software in windowed mode to run in kind of a magnified mode. You define how many pixels the window should use "virtually", and then the interface and cointent of the software gets scaled to that value , no matter the real window size.

In other words I want the game - Danube 85, btw - to give on my 1680 screen the graphics sizes that it opriginally was designed for, meaning that the hexes and counters should be displayed not by the native pixel resolution, but should get scaled up in pixel so that the display more or less meets the orginal design again like on an old screen with 1024 resolution.

Ideal would be an application that tells the game to launch inside a screen-filling window with a "native" resolution of let'S say 1280x960.

I could of course resize the whole desktop size every time I launch the game, but then I would need to rearrange by whole desktop once I have switched back. I want that to be done automatically, and using the whole screen size for the game nevertheless.