You are probably asking why view .CHk files as text files? Well the only reason I can think of is to identify the original file type, before it was renamed into a .CHK file.
Warning: This involves editing the windows registry and therefore is not recommended for new computer users. One wrong move in this area can render your computer unusable. If you choose to proceed with this tutorial please backup your Windows registry first.
View CHK Files as Text Files
Now viewing these files as text does not guarantee you will be able to identify them as it is not always that easy. However sometimes you will see a clue. This edit below will allow you to open the file as a text file or preview it in a preview pane in windows explorer.
1. Open the Windows Registry as an administrator. To do this type regedit into the search box on the start menu. Then when you see regedit in the menu, right click on choose run as admin.
2. When the Registry editor opens go to the edit menu and choose find from the menu. We are going to search the Windows registry for .chk.
3. See the screenshot below. I have typed in .chk. Now press the find next button.
4. You will be taken to the .chk folder. In the right pane you will see the strings associated with .chk. See the screenshot below.
5. Right click in the blank space on the right and choose new.
6. Then choose string value from the menu.
7. Type in the name of your string value which is Content Type. Then right click on the new string, choose modify and add the value text/plain.
8. You can also add another string called PerceivedType as already shown above. But the value shows as system and we want to change it to text.
You can go back and reverse these changes any time.
Now your .chk file will open in a notepad. You might see a path to the original file as I did in the screenshot below, or maybe a file signature (which is a code for the file type). See a file signatures table at Gary Kessler’s site.
Text File is Gibberish
If you cannot get any clues from your text file, you can also download a free Hex Editor to view more details.