Sounds Raw

There are many ways to create sound effects. Recording different sounds and actions, vocalizations, Digital Audio Workstations (DAWs), sfx generators (Bfxr, LabChirp), and sound editing. One option most people are unaware of in importing files as raw data. This is easiest is Audacity.

Once you have installed and opened Audacity, choose 'File > Import > Raw Data' and choose a file on your computer.

There are some things to keep in mind.
Any file can be used, even video and audio files.
Avoid opening files larger than ten megabytes.
Files around five megabytes seem to have the best results.
On average, one megabyte of data equates to about 4-10 seconds of audio.

You'll usually see something like the image below.

This is mostly noise. You'll have to remove the noise to find any potential audio gems. Select a small sample of the noise with the selection tool. The selection tool looks like a giant "I" under the Analyze menu. Now chose with 'Effect > Noise Reduction'. A new  window will open.

Click 'Get Noise Profile' then reopen the noise reduction window. Copy the settings, or choose your own, then click OK.Next use 'Effect > Repeat Noise Reduction' or use Ctrl + R. You'll want to reduce the noise 2-3 times for best results. The noise reduction takes an average of one second for every ten seconds of audio.

The first file I used yielded no results, so I tried a second file.

Installation files and jar files seem to give the most sounds. You'll usually get chirps, horns, beeps, squeaks, rumbles, and heartbeats from this. 'File > Export' the audio as Wav format to work on later. Now you can split and modify the separate sounds to something you find useful.

Your results and mileage may vary.