I have a DLink DCM202 cable modem. Comcast just upped our internet service from 6 to 12 mb, but I am unable to achieve that speed because the modem needs a firmware update. I went to DLink's site and downloaded firmware version 2.0.1 for Comcast service. The problem is that the file is an exe and I am wary about opening that up. Comcast and DLink are blaming each other for the problem. I think Comcast wants to sell me a Motorola modem and DLink doesn't have a way for me to upgrade.

It is strange that the file is an .exe one. Usually firmware comes in .bin. If this is the only option, you might attempt to open the file from within the modem window in the browser when you log in. I have seen firmware files that do not open with a double click but the modem updater accepts them. Otherwise, you got the wrong model for Comcast, it seems. See:
http://www.dealtime.com/xPR-D-Link-DOCSIS2-0-CABLE-MODEM-USB-ENET~RD-164461317764
Usually, the cable company would sell a modem to you that is compatible with their service and give you up to 100% discount.
Alex
2.3 GHz DP G5, 1 GB RAM, OS 10.4.11.

The file is an .exe because it's for Windows users. I think stoneage's assessment is correct, but I agree with you that Comcast might be willing to provide a compatible modem to avoid alienating an existing customer...

Yep, D-Link really screwed the pooch with the Comcast upgrade. The .exe file is a Microsoft Windows TFTP (Trivial FTP) program that is used to transfer the .bin firmware image. D-Link never thought about Mac and Linux users, so if you're using a Mac or a Linux machine you have no easy way to apply the update. (Stupid, stupid, stupid, incompetent D-Link morons. No biscuit!)

You have three choices:

1. Take your cable modem and the update to a friend's house and use your friend's Windows computer to update it.

2. Run Windows on your Mac. You can do this in Boot Camp or Parallels. Run the .exe file in Windows.

3. Use the Mac's built-in TFTP client to apply the update. This is a somewhat convoluted procedure that uses Terminal commands. There is a Web page describing how to do it here.

(you left a space after the "url=" tacit.)

here's tacit's link until he fixes it!