[knc1]

Originally Posted by Dcxx

Used 7zip as I couldn't install anything on my computer:

Spoiler:

C:\Program Files\7-Zip>7z l "F:\main-htmlviewer.tar.gz"

7-Zip [64] 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18

Listing archive: F:\main-htmlviewer.tar.gz

--
Path = F:\main-htmlviewer.tar.gz
Type = gzip

Date Time Attr Size Compressed Name
------------------- ----- ------------ ------------ ------------------------
2016-07-15 02:20:00 ..... 10240 592 main-htmlviewer.tar
------------------- ----- ------------ ------------ ------------------------
10240 592 1 files, 0 folders

C:\Program Files\7-Zip>7z l -slt "F:\main-htmlviewer.tar.gz"

7-Zip [64] 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18

Listing archive: F:\main-htmlviewer.tar.gz

--
Path = F:\main-htmlviewer.tar.gz
Type = gzip

----------
Path = main-htmlviewer.tar
Size = 10240
Packed Size = 592
Modified = 2016-07-15 02:20:00
Host OS = Unix
CRC = 1E25D898

Is drive F: the Kindle's USB storage?
The entire point is to test the file as it is, on the Kindle's USB storage in the exact place the Kindle will be looking for it.

The one that failed should still be on your Kindle, since the command failing does not remove it.
THAT is the one to test, exactly where it sits, immediately before unplugging the Kindle from your computer and then using the main searchbar command.