.PART File Extension

2 file types use the .part file extension.

Partially Downloaded File

Developer N/A
4.1  |  1569 Votes

What is a PART file?

A PART file is a partially downloaded file from the Internet used for downloads that are in progress or have been stopped. Some PART files can be resumed at a later time using the same program that started the download. PART files are typically used by Mozilla Firefox and several file transfer programs, such as Go!Zilla, eMule, and the discontinued eDonkey program.

More Information

When downloading a file with Firefox, the web browser creates a PART file in the "Downloads" folder on your computer. You may see the PART file if the file is currently downloading or if the download was interrupted before completion. A download interruption could be due to a lost Internet connection, the Firefox browser or computer crashing, or to you pausing the download.

As Firefox downloads the file, the program creates a PART file to store the data being downloaded. Firefox replaces the name of the file with a string of characters and appends the .part extension to the extension of the file. For example, the file example.mov would have the name ZT5KR1EL.mov.part when it is being downloaded. Once the download is complete, Firefox removes the .part extension and the file is ready to be used.

You may also encounter PART files when using Skype on a Mac. If a PART file keeps reappearing while using the program, move the file to the trash and make sure it's the only file in the trash. Then, right-click the "Trash" icon, hold the "Command" key, select Secure Empty Trash, and verify that the trash is empty. Now, when you reopen Skype, the PART file should no longer reappear.

How to open a PART file

You may be able to open interrupted Firefox download files even though they are incomplete. Simply delete the .part extension then attempt to open it with the appropriate program. Several audio and video file types, including .MP4, can still be played by a media player if they are not yet fully downloaded. However, these incomplete files will only contain portions of the file.

If you are unable to open the file, go to the "Downloads" section in Firefox, select "Show All Downloads," and click the "Reload" arrow icon next to the incomplete file to resume the download. If this option is unavailable for your download, you can delete the PART file and download the file again. If you cannot resume the download, delete the PART file and re-download the file again.

Open over 400 file formats with File Viewer Plus.Free Download

Programs that open PART files

PartDesigner Part

Developer The LEGO Group
4.3  |  6 Votes

A PART file may also be a custom LEGO part created in LEGO PartDesigner. It contains plain text data that specifies what LEGO bricks (and other elements) the part includes. LEGO enthusiasts can import the parts that PART files contain into LEGO BrickLink building projects.

More Information

Screenshot of a .part file in LEGO PartDesigner
PART file open in LEGO PartDesigner

LEGO PartDesigner is a multiplatform app that LEGO enthusiasts use to design and decorate custom LEGO parts. For example, a PartDesigner user could create a custom column and sticker that column with an imported .PNG decal.

Each part created in PartDesigner is saved as a PART file. Typically, PART files are comprised of multiple LEGO bricks and other elements. These elements' type, size, geometry, and positions are specified as plain text data in the PART file.

After a user finishes editing a PART file, they can export the part it contains to LEGO BrickLink, for inclusion in a BrickLink model (.IO file). They can also share the part online, by submitting it to the online BrickLink Studio part library.

How to open a PART file

You can open a PART file in LEGO PartDesigner (Windows, Mac):

  1. Select File → Open... from PartDesigner's menu bar.
  2. Navigate to and open your PART file.

How to Export a PART File to LEGO BrickLink Studio

To export a PART file from PartDesigner to LEGO BrickLink Studio:

  1. Open the file in PartDesigner.
  2. Select File → Export As → Export to Studio....
  3. When the Export to Studio window appears, select Export.

The part your PART file contains will now be available in BrickLink Studio's Custom Parts Palette.

Programs that open PART files


Verified by FileInfo.com

The FileInfo.com team has independently researched all file formats and software programs listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

If you would like to suggest any additions or updates to this page, please let us know.