Windows 10: When i compress a ZIP file there isn't the file extension

At the end of the file name it doesn't say .zip and its very confusing as i am not familiar with these situations

:)

 

Compress files??

using upx? to compress exe files
but you need to make it executable zip first then do upx

 

So I used KGB Archiver to compress a 10gb file into a 40mb file...

Exactly. Most compression programs change a series of 1s and/or 0s to a couple of digits, and stores the total file in a table of contents/index. If you've got a file with TONS of repeating digits, sure, but pictures? No way to get that kind of compression in the real world.


from an article on "How To Geek"

First, we installed Bastion and compressed its folder — about 863 MB in size of music, graphics, executable files, and various different types of documents:

• Zip (Windows 8.1): 746 MB (86.4% of the original size)
• Zip (WinZip): 745 MB (86.3% of the original size)
• RAR (WinRAR): 746 MB (86.4% of the original size)
• 7z (7-Zip): 734 MB (85% of the original size)

Next, we compressed Hotline Miami, which is 654 MB of data:

• Zip (Windows 8.1): 316 MB (48.3% of the original size)
• Zip (WinZip): 314 MB (48% of the original size)
• RAR (WinRAR): 307 MB (46.9% of the original size)
• 7z (7-Zip): 301 MB (46% of the original size)

I would not expect a great deal of change from those numbers in November of 2014 to now, nor would I expect any real-world files to come any where NEAR the compression rate of .4%.

 

compressed Zip Folders

The word 'zip' means compressed. So calling something a zip compressed folder is redundant ;-)

The term originated with a very popular, old file compression program called Pkzip, which used the file extension .zip

All photos lose data when compressed; some more, some less, depending on the photo's format. Most popular photo formats used today - like .jpeg - are already compressed, so compressing them further won't reduce their file size much.

Here's something very important to know about compressing photos: Compression works by discarding redundant pixels - that's why the file size becomes smaller. Once discarded, those pixels can never be recovered, which means the quality of the image will
suffer if you compress it too much or too often.