File Extension Issues (No, I tried that...)

The typical answer for this is either:

1) Go into the Default Programs feature (in the Control Panel) and "Associate a File Type or Protocol with a Program.

Or

2) Right click > Open with... > choose the default program and click the box to do it "always".

Unfortunately, this is not working. I have AutoCAD on my computer now and I cannot associate the .dwg files with AutoCAD. Then I recently downloaded an Atari emulator and none of the game's .a26 files will map to the emulator.

What am I to do? This is much more than a know-nothing end user.

PLEASE HELP!
 

My Computer

My Computer

System One

  • Manufacturer/Model
    HP dv2519tu pavillion Laptop
    CPU
    1.50 GHz
    Motherboard
    Winstron
    Memory
    2.5 gig RAM
    Graphics Card(s)
    intel onboard
    Sound Card
    Conexant HD Smart Audio HD2
    Monitor(s) Displays
    HP Brightview Display
    Screen Resolution
    1280X800
    Hard Drives
    SATA - 160 + 500 GB
    PSU
    HP
    Case
    HP Laptop
    Cooling
    Air
    Keyboard
    HP Laptop
    Mouse
    HP
    Internet Speed
    4 MB/SEC-Download, 2 MB/SEC-Upload
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