Software & Apps File Types What Is an MPLS File? How to Open, Edit, & Convert MPLS Files Share Pin Email Print File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated February 19, 2020 A file with the MPLS file extension might be a Mathcad Font file used by the PTC Mathcad engineering math software. The Blu-ray Playlist format also uses the MPLS extension—they're similar to MPL files and are typically stored with a file name consisting of five digits, like xxxxx.mpls, in the \bdmv\playlist\ directory on the disc. Audio Playlist files (.PLS) are similar to MPLS files in that they're also used as a playlist file, but don't confuse the two; different programs are used to open them and they aren't used in the same context. MPLS also stands for Multiprotocol Label Switching but has nothing to do with any of the MPLS files you might be dealing with. How to Open an MPLS File Mathcad seems the likely program to open an MPLS Mathcad Font file but it's unclear if it's actually openable by the program itself or if the software just uses MPLS files automatically when they're stored in a specific folder. Let us know if you know either way for sure. If your MPLS file is a Blu-ray Playlist file then any Blu-ray player should be able to play the files listed in the playlist. Otherwise, you can try a program like VLC, Media Player Classic Home Cinema (MPC-HC), MediaPlayerLite, JRiver Media Center, or CyberLink PowerDVD. BDInfo is a portable program (it doesn't need to be installed in order to use it) that can open MPLS files, too. This program can use the MPLS file to see how long the video files are and which specific videos the MPLS file references. Is your MPLS file in none of the above formats? It's possible that you have one that's completely different and therefore can't be opened in any of these programs. If so, try viewing the MPLS file as a text file with a text editor program like Notepad++. You might find some text at the very beginning or end of the file that indicates what format it's in, which can help you find a suitable application for opening or editing it. If you find that you have more than one program that opens MPLS files but the one that's doing it by default isn't the one you'd like, this is pretty easy to change. See How to Change File Associations in Windows for help doing that. How to Convert an MPLS File We don't have any specific information on converting MPLS files that are used with Mathcad, but if it's possible to convert them then you can probably do so with the Mathcad program through some sort of File > Save As or Export menu option. If your MPLS file is a Blu-ray Playlist file, remember that it's just a playlist file and not an actual video file. This means you can't convert an MPLS file to MKV, MP4, or any other video file format. That said, you can, of course, convert actual video files from one format to another with a free video file converter. The same is true for subtitle formats like SRT. MPLS to SRT isn't a proper conversion method because the MPLS file is just a list of video files, not a stream of text that can be displayed as subtitles during a movie. Still Can't Open the File? Something you might consider if you still can't open your MPLS file even after trying the programs from above, is that you're misreading the file extension. Some file extensions belong to formats that are completely unrelated to the ones mentioned on this page, even if the suffixes do look a lot alike. MPN, MSP (Windows Installer Patch), MLP (Meridian Lossless Packing Audio), MPY (Media Control Interface Command Set), and PML (Process Monitor Log) files are just a few examples, but many more could be given. If you find out that the file extension really isn't MPLS, then research the real one to learn more about the format, which should help you find a program capable of opening or converting it. More Information on MPLS Files If you're interested in some advanced reading, there's a lot more to learn over at Wikibooks on the structure and format of an MPLS Blu-ray Playlist file.