The computer automatically changes the color of the file name to describe the file.
Files with blue file names signify that the file is compressed.
Files with green file names signify that the file is encrypted.
What program affected the automatic change?
Windows Disk Cleanup
How to change blue file names back to black?
Right click on the file name
Click properties
Go to "General" Tab > find "Attributes" > click "Advanced"
Uncheck "Compress Contents to Save Space"
Note: This process will decompress the file.
How to change all the file name back to black without decompressing any file?
Go to Tools > Folder Options > "View" Tab > Advanced settings
Uncheck "Show encrypted or compressed NTFS files in color"