The folks over at SDR# have uploaded an updated plugin for ExtIO compatible software.
You can download your copy from [LINK REMOVED - it appears SDR# has removed the file]
To use it, extract to the same folder as SDR#/HDSDR/WRPlus/etc and select the ExtIO_RTLSDR.dll depending on your software instructions. (HDSDR will prompt you which ExtIO plugin you want to use if you already have another ExtIO DLL installed.)
Download and install http://www.hdsdr.de/download/HDSDR_install.exe Follow the instructions and remember where you installed it to. (YOU CAN SKIP THIS STEP IF YOU SELECT TO INSTALL HDSDR VIA THE SETUP PACKAGE IN STEP 2)
Extract the first .ZIP you downloaded and run the installer contained within. Install to the same folder as HDSDR. During the install process, you will be asked to install the Zadig drivers. If your dongle doesn’t automatically show up, select Options then List all Devices. Select Bulk in Interface 0 (NOT 1 if that shows up) and click Install Drivers or Replace Drivers. Close the Zadig installer and complete the rest of the install.
When completed, extract http://spench.net/drupal/files/librtl2832++.zip to the same folder as where you installed HDSDR (or ExtIO if you chose a different location). You may have to delete/rename the existing file before replacing it.
Ignore errors you see on first launch. There should be two windows that open HDSDR and Device Control. Select the Device Control window and under “Device Hint” put “RTL readlen=8192 tuner=e4k” without the quotation marks. Click Create. Hopefully it should work and you can go back to the HDSDR window, click START (or hit F2) and begin tuning around.
THESE INSTRUCTIONS ARE A WORK IN PROGRESS BASED ON MY PERSONAL EXPERIENCE. CLARIFICATION MAY BE NEEDED.
Any questions, please ask and I will do my best to answer and clarify this post.
Here is a video about the same process:
I did notice when I was following the above video I had a few different results than shown. For me a driver was automatically installed via Windows Update and it did not show up by default in the Zadig list (had to select List all Devices). Zadig showed I already had some sort of default RTL2832U driver installed not just (NONE). Replacing the driver worked fine but it wasn’t until I used the “Device Hint” “RTL readlen=8192 tuner=e4k” that it worked properly.
Note: The above instructions require you have a basic knowledge of using computers and installing software. Be sure to read all instructions on your screen provided by the installers.
The RTL2832U outputs 8-bit I/Q-samples, and the highest theoretically possible sample-rate is 3.2 MS/s, however, the highest sample-rate without lost samples that has been tested so far is 2.8 MS/s. The frequency range is highly dependent of the used tuner, dongles that use the Elonics E4000 offer the widest possible range (64 - 1700 MHz). (Source: http://sdr.osmocom.org/trac/wiki/rtl-sdr)