Tested in chrome # 56.0.2924.87 and 58.0.3027.0 on win 10.0 & 7 and not able to reproduce the issue.Please find the screen cast for your reference.

@ marshaul: Could you please let me know if i have missed anything and if possible, provide us with a sample URL of the issue which would help us to triage the issue further.

Thanks in Advance.

Deleted: 693923.mp4 1.6 MB

	693923.mp4 1.6 MB View Download

2. Open file in something which marks it as "in use" before the download finishes


Download a large file e.g. a movie. Open it in VLC or mpc-hc video player while it is dowloading (= while is still has .crdownload extension). When chrome reaches 100% downloading while movie is still being played by vlc or mpc-hc, then chrome deletes the file (playing of the movie in vlc or mpc-hd crashes because the file was deleted by chrome) and chrome starts to download the file again.

@rbasuvula what you are missing is that you click "open file" while the file is downloading but the chrome opens the file after it was downloaded. you need to truly open the file while it is downloading. E.g. Open a video file in video player when only 20% of the file was downloaded ( you can do this by dragging and droppin 20% downloaded file with .crdownload file into video player).

Now you have your video playing in your video player. At the background chrome is donloading the rest of the video. When chrome reaches 100% of downloading it deletes the video (probably because video is open in video player and chrome can not rename it = remove the .crdownload extension). chrome thinks the download had failed and starts downloading from the beginning, It replaces the fully donloaded file, thus effectively deleting a completely downloaded video file.

User nothinke...@gmail.com has it exactly correct. 

rbasuvula, perhaps you need to read more carefully. As I explained, the problem is downloading a large file, and opening that file in another program WHILE THE DOWNLOAD IS IN PROGRESS.

If the download completes and the file is marked "in use" by another program when this occurs, chromium will attempt to re-download the entire file.

This will occur in an infinite loop if the second program continues to mark the file as "in use". 

Updated Steps to Reproduce:

1. Download large movie file. Do NOT wait for it to complete...

2. While download is in progress, open movie file in VLC. Leave it open!

3. When download completes, Chromium will delete the file and re-download from the beginning. 

Thank you for providing more feedback. Adding requester "rbasuvula@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I have been experiencing this since a summer update of Chrome. There used to be an option in chrome://flags that would fix this, but alas that "experiment" was removed in the fall.

See here: https://productforums.google.com/forum/#!msg/chrome/n8JqBz5Q2_I/W85Ve8PeBAAJ

All we need is that experiment turned back on so us advanced users can use Chrome the way we want. There is no need to merge this into more complicated issues like the dozen other issues covering this exact bug. It seems that every other issue related to this is closed and merged with a bug that has been open since 2010.

Issue has not been modified or commented on in the last 365 days, please re-open or file a new bug if this is still an issue.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot