A .BMK file is usually a bookmark-like file but varies widely because `. If you loved this post and you would like to get more info regarding BMK file extension kindly go to the web page. bmk` has no universal format, so different programs embed items like labels, titles, page indices, timestamps, file paths, or coordinate data in their own way; some BMKs are plain text—readable in Notepad—while others are binary and appear as gibberish, commonly used for document bookmarks, multimedia time markers, CAD/map saved views, or app resume points, and you can usually figure out which type you have by examining where it was found and whether its text opens cleanly.

To figure out what a .BMK file is, you should find out what it was stored with and then determine if it’s text or binary, so look at the directory—program-specific folders, AppData, or spots next to a PDF/video often identify the parent app—inspect Properties for info, and try opening it in Notepad: readable patterns indicate a text bookmark list, while unreadable symbols mean a binary file requiring the originating software, and similarly named neighboring files usually show what document or media the BMK belongs to.

A .BMK file may belong to any of several programs, so determining its exact type requires discovering the generating app and examining its structure; check its storage location, the "Opens with" field, and how it looks in a text editor—if readable elements like URLs, timestamps, or structured text appear, it’s a text-based bookmark, but if it shows random symbols, it’s a binary format usable only through the program that originally produced it.

Once you know the .BMK type, the correct opening/conversion path is straightforward, with text-based BMKs easily opened in Notepad++ for safe viewing so you can convert them into `.txt`, `.csv`, or URL bookmark formats, while binary BMKs require their parent application to load bookmarks/markers and then export to formats like XML, CSV, or cue lists, and if you lack source info, identifying the app by folder context and readable embedded text is usually the key to unlocking conversion options.

A "bookmark file" acts as a stored set of return points that lets the program remember exactly where you left off, containing a bookmark name plus a reference like a page number, timestamp, heading ID, or location data such as coordinates or zoom, and when the related content loads again the app reads the BMK to repopulate bookmarks or timeline markers, but without the original file the BMK is usually meaningless because it stores only directions, not the content.