![]() If the handle-based access refers to a file that was opened before FileMon started, FileMon will not find the mapping in its hash table and will only display the value of this handle. Whenever it monitors a handle-based call, it will look up the handle in the hash table to get the full name to display. When FileMon monitors an open, create, or close call, it will update the internal hash table used as a mapping between internal file handles and file path names. On Windows NT, the core of FileMon is the file system driver, which creates a filter device object and attaches it to the target file system device object so that FileMon can monitor all IRP and FastIO requests for the drive. It will be dynamically loaded, and when it is initialized, the file system filter is installed through the VxD service IFSMGR_InstallFileSystemApiHook so that it can insert itself into the call chain of all file system requests. In many troubleshooting scenarios, only the open operation is concerned, for example:įor Windows 9x drivers, the core of FileMon is the virtual device driver Filevxd.vxd. Other filter options can select or deselect read, write, or open operations. Select the highlight color through "Edit | Highlight Color". Use the highlight filter to specify the output content to be highlighted in the list view output. For example, the inclusion of the filter "Winword*Windows" allows FileMon to display only Microsoft Word files and directories that contain the word "Windows". ![]() Wildcards support the matching of compound patterns, so that it can match specific file access by specific applications. Note for Windows NT/2000: Due to the asynchronous nature of file I/O, the result field cannot be filtered.įor example, if the include filter is "c:/temp" and the exclude filter is "c:/temp/subdir", the files and directories under c:/temp (except c:/temp/subdir) will be monitored All references. Multiple strings in the filter are separated by " " (such as "filemon temp"). Only show matches that appear in the include filter but are excluded by the exclude filter. ![]() The "*" wildcard character can match any string, and the filter is not case sensitive. You can use the "Filter" dialog box (accessible via the toolbar button or select the "Edit|Filter/Highlight" menu) to select the data that will be displayed in the list view. If Filemon's internal buffer overflows during a very heavy activity, this will be reflected by the interval of the serial number.Įvery time you exit FileMon, it will remember the configured filters, window position, and output column width. When printing events to the output, these events are marked with a serial number. To disable the capture function when starting it, use the/o switch on the command line. When FileMon starts, it will automatically capture file system activity. To start FileMon without displaying a prompt, specify the/q switch on the command line. If a filter is specified, every time you start FileMon, it will ask you to confirm whether to use the filter used in the previous session. You can use menus, hotkeys or toolbar buttons to clean up windows, select and deselect monitored volumes (Windows NT/2K/XP) including network volumes, save monitored data to files, and filter and search output. When FileMon is started for the first time, it will monitor all local hard drives. You must have administrator rights to run FileMon. If you have any questions or questions, please visit the Sysinternals Filemon forum. If you find information overload, you can solve it by setting one or several filters.įileMon can run on NT 4.0, Windows 2000, Windows XP, Windows XP and Windows Server 2003 64-bit version, Windows 2003 Server, Windows 95, Windows 98 and Windows ME. It starts to monitor once it is started, and its output window can be saved to a file for offline viewing. FileMon easy to use and can be mastered in a few minutes. Filemon timestamp function will show you exactly the time of each open, read, write or delete, and its status column will show you the final result. Its various advanced features make it a powerful tool for exploring how Windows works, viewing applications' use of files and DLLs, or discovering problems in the system or application file configuration. Filemon and Regmon are reserved to support older operating systems, including Windows 9x.įileMon can monitor and display the file system activities in the system in real time. Note: In Windows versions starting from Windows 2000 SP4, Windows XP SP2, Windows Server 2003 SP1 and Windows Vista, Filemon and Regmon have been replaced by Process Monitor. Microsoft's file monitor can intuitively monitor and display the file system activities in the system, which is a good tool
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