This is due to the fact that some files are themselves small and that others are already compressed the jpg file format is a compressed format. Well, if time is not an issue and you feel lazy, one way of uncompressing multiple files in a noncompressed folder — easily, is first compress the folder, then uncompress it applying changes to subfolders and files.
That only takes two steps instead of having to select all the compressed files. Am I wrong in the assumption that a compressed Windows file will automatically be decompressed on its next use? The reason I ask is why bother manually decompressing files if Windows needs to do it to run the file? Yes, Windows does indeed, completely transparently, decompress and then recompress, any compressed file that is called up for use.
If you alter the file and re-save it, the new version will automatically get recompressed as soon as you close the file. These files will not benefit from compression because they are compressed already , and actually stand a good chance of being made larger than they were to start with! On the other hand, BMP and WAV files can and should be compressed, because these are both uncompressed file formats that are both typically very large the former a picture file format, the latter a soundfile.
Two other things to note about Windows compression. Good third-party encryption tools, however, have their own compression algorithms and will compress your file before encrypting it, which not only makes the file smaller but actually improves the security of the encryption. WinZip in particular is famous for this, and is highly regarded. It uses the AES encryption algorithm, and a heavy-duty compression.
It should scarcely need saying that such files — being already compressed — should never be placed within a compressed folder, or otherwise marked for compression by Windows. Thanks for the response, Leo and Glenn P. So, compressing a lot of files, especially on a less powerful PC could have performance consequences. I was aware Windows would need to decrompress a file to load it into memory and use it; I was not aware it would leave the saved file compressed on disc.
But you failed to say how to turn off the compress option. Clear it if only some files are compressed, this may require more than one click and then click Apply. I use a screen reader for computer access. It has to do with their usability as a sighted person.
So you would have to enlarge it so much the picture would become blurry because the pixels were so big. Is this picture in my mind true? Any insight would be appreciated. Make sure you know how to restore them. Sign up to join this community.
The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Is the Windows. What files does it contain?
Ask Question. Asked 1 year, 4 months ago. Active 1 year, 4 months ago. Viewed times. Improve this question. Lapraniteon Lapraniteon 88 7 7 bronze badges. Cancel Submit. Are you talking about the line, compress old files?
If your useing disk cleanup utility from system tools. All that means is the utility will compress the files you dont use or haven't used in awhile. In other words squeeze the files so they don't take up too much space.
It doesn't delete them. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site. In reply to hewlit's post on May 14, In reply to billybgood's post on August 18, I am saving up for a pony!
In reply to A. User's post on August 19, Awhile means you haven't activated it for a period of time determined by a computer generated time frame. And I'd be careful useing CClean. In reply to hewlit's post on August 19, That is too unspecific for me. I know what it sounds like it means.
Maybe you can help me figure it out. What is the definition of activated? How long must a file be in this state before it is determined to be inactive? I don't know the answer either and don't use the feature but wondered about it once.
I've heard rumors but they usually end up being self inflicted wounds, but I have never seen anything personally, but would like to I have CCleaner installed right now - what bad things could I do to my system using it that would not be my own fault? Please vote my posts as helpful so I can get lots of points. To start with. Just right-click a drive in Windows Explorer and select Properties from the resulting pop-up menu.
The file system type will be displayed in the General tab of the Properties window. Some file types compress better than others. NTFS compression is well-suited to a range of file types, including:. This happens because Windows is automatically decompressing files for you behind the scenes whenever you open them. When you close the file, Windows then compresses it again.
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