| Subject | English | Welsh |
| comp., MS | backup file | ffeil wrth gefn (A duplicate of a program, a disk, or data, made either for archiving purposes or for safeguarding files) |
| comp., MS | binary file | ffeil ddeuaidd (A file that contains encoded information that is interpreted according to the application that created it. In general, a binary file can be edited only by the application in which it was created) |
| comp., MS | Binary Interchange File Format | Fformat Ffeil Cyfnewid Deuaidd (The binary file formats that are used to save Microsoft® Office Excel® workbooks) |
| comp., MS | .cab file | ffeil .cab (A single file that stores multiple compressed files. These files are commonly used in software installation and to reduce the file size and the associated download time for Web content) |
| comp., MS | cabinet file | ffeil cabinet (A single file that stores multiple compressed files. These files are commonly used in software installation and to reduce the file size and the associated download time for Web content) |
| comp., MS | comma-delimited text file | ffeil testun wedi'i wahanu gydag atalnodau (A data file consisting of fields and records, stored as text, in which the fields are separated from each other by commas) |
| comp., MS | comma-separated value file | ffeil gwerthoedd wedi'u gwahanu gydag atalnodau (A data file consisting of fields and records, stored as text, in which the fields are separated from each other by commas) |
| comp., MS | concordance file | ffeil mynegai (An index file with two columns: the first column lists the text in the document that you want to index, and the second column lists the index entries to generate from the text in the first column) |
| comp., MS | CSV import file | ffeil mewngludo CSV (A comma separated value (CSV) file used to provision many new users at one time) |
| comp., MS | data connection file | ffeil cyswllt data (A file that stores information about a connection to a data source, such as an Access database, spreadsheet, or text file, and that facilitates data source administration) |
| comp., MS | data file | ffeil ddata (A file consisting of data in the form of text, numbers, or graphics, as distinct from a program file of commands and instructions) |
| comp., MS | default data file | ffeil data ddiofyn (The .pst data file used as the main delivery location for your e-mail messages) |
| comp., MS | delimited text file | ffeil testun wedi'i amffinio (A file containing data where individual field values are separated by a character, such as a comma or a tab) |
| comp., MS | destination file | ffeil derbyn (The file that a linked or embedded object is inserted into, or that data is saved to. The source file contains the information that is used to create the object. When you change information in a destination file, the information is not updated in the source file) |
| comp., MS | Efficient File Storage | Storio Ffeiliau Effeithlon (A storage method in which a file is split into pieces that are stored and updated separately, and streamed together when a user requests the file) |
| comp., MS | file allocation table | tabl dyrannu ffeiliau (A file system used by MS-DOS and Microsoft Windows operating systems to organize and manage files) |
| comp., MS | File as Printout | Ffeilio ar ffurf allbrint (A command that will use a print driver installed by OneNote to create an image of a wide variety of filetypes. Files are printed to the print driver and inserted as images into OneNote) |
| comp., MS | File Block | Bloc Ffeiliau (A feature that allows end users and IT admins to control which file types and versions can be opened and saved in the application) |
| comp., MS | file buffer | byffer ffeil (A reserved portion of memory used to temporarily store data, pending an instruction to complete its transfer to or from a file) |
| comp., MS | File Explorer | Chwilotwr Ffeiliau (A utility in Windows that enables the user to locate and open files and folders) |
| comp., MS | file format | fformat ffeil (The structure or organization of data in a file. File format is usually indicated by the file name extension) |
| comp., MS | File History | Hanes Ffeiliau (A Windows feature designed to help users avoid data loss by automatically saving versions of files and copies of deleted files so that users can recover them) |
| comp., MS | File menu | dewislen Ffeil (A common drop-down menu that includes commands for file operations, such as Open, Save, and Print) |
| comp., MS | file name extension | estyniad enw ffeil (A set of characters added to the end of a file name that identifies the file type or format) |
| comp., MS | file picker | dewisydd ffeiliau (A UI element that enables users to locate and select files) |
| comp., MS | file plan | cynllun ffeil (The primary records management planning document) |
| comp., MS | file property | priodwedd ffeil (A detail about a file that helps identify it, such as a descriptive title, the author name, the subject, or a keyword that identifies topics or other important information in the file) |
| comp., MS | file replication service | gwasanaeth dyblygu ffeiliau (A service that provides multimaster file replication for designated directory trees between designated servers running Windows Server 2003. The designated directory trees must be on disk partitions formatted with the version of NTFS used with the Windows Server 2003 family. FRS is used by Distributed File System (DFS) to automatically synchronize content between assigned replicas and by Active Directory to automatically synchronize content of the system volume information across domain controllers) |
| comp., MS | file sharing program | rhaglen rhannu ffeiliau (A peer-to-peer file sharing client used to connect to file sharing networks in order to download or share files) |
| comp., MS | file system | system ffeiliau (In an operating system, the overall structure in which files are named, stored, and organized. NTFS, FAT, and FAT32 are types of file systems) |
| comp., MS | File tab | Tab ffeil (A tab on the ribbon that takes users to Microsoft Office Backstage view) |
| comp., MS | File Transfer Protocol | Protocol Trosglwyddo Ffeiliau (A member of the TCP/IP suite of protocols, used to copy files between two computers on the Internet. Both computers must support their respective FTP roles: one must be an FTP client and the other an FTP server) |
| comp., MS | file type | math o ffeil (The format of a file, commonly indicated by its file name extension. The file type indicates which program the file was created in and can be opened with) |
| comp., MS | form definition file | ffeil diffiniad maes (An XML file with an .xsf extension that contains information about all other files and components used within a form, including user interface customizations, XML Schemas, views, business logic, events, and deployment settings) |
| comp., MS | Hibernation File Cleaner | Glanhau Ffeiliau a Grëwyd wrth Gysgu (A feature that allows deletion of the files created during hibernation) |
| comp., MS | log file | ffeil cofnodi (A file that stores messages generated by an application, service, or operating system. These messages are used to track the operations performed. Log files are usually plain text (ASCII) files and often have a .log extension) |
| comp., MS | long file name | enw hir ar ffeil (A folder or file name longer than the 8.3 file name standard (up to eight characters followed by a period and an extension of up to three characters). Most versions of Windows, including WindowsXP, Windows2000, WindowNT, Windows95, and Windows98 support long file names up to 255 characters) |
| comp., MS | media file | ffeil cyfryngau (A file that contains audio, video, or script data) |
| comp., MS | NTFS file system | system ffeil NTFS (An advanced file system designed for use specifically with the Windows NT operating system. It supports long filenames, full security access control, file system recovery, extremely large storage media, and various features for the Windows NT POSIX subsystem. It also supports object-oriented applications by treating all files as objects with user-defined and system-defined attributes) |
| comp., MS | ODC file | ffeil ODC (A file that stores information about a connection to a data source, such as an Access database, spreadsheet, or text file, and that facilitates data source administration) |
| comp., MS | Office compatibility definition file | Ffeil diffiniadau cydnawsedd Office (A file that stores information about compatibility issues and workarounds and makes it available to the Office Telemetry Log and Office Telemetry Dashboard) |
| comp., MS | Office data connection file | ffeil cyswllt data Office (A file that stores information about a connection to a data source, such as an Access database, spreadsheet, or text file, and that facilitates data source administration) |
| comp., MS | Office File Validation | Dilysu Ffeiliau Office (A security feature that validates files before allowing them to be loaded by the application, in order to protect against file format vulnerabilities) |
| comp., MS | offline cube file | ffeil ciwb all-lein (A file you create on your hard disk or a network share to store OLAP source data for a PivotTable or PivotChart report. Offline cube files allow you to keep working when you are not connected to the OLAP server) |
| comp., MS | offline folder file | ffeil ffolder all-lein (The file on your hard disk that contains offline folders. The offline folder file has an .ost extension. You can create it automatically when you set up Outlook, or when you first make a folder available offline) |
| comp., MS | output file | ffeil allbwn (The packaged Windows Media file that is created with Windows Media Rights Manager SDK) |
| comp., MS | page file | ffeil tudalennau (A hidden file on the hard disk that Windows uses to hold parts of programs and data files that do not fit in memory. The paging file and physical memory, or random access memory (RAM), comprise virtual memory. Windows moves data from the paging file to memory as needed and moves data from memory to the paging file to make room for new data) |
| comp., MS | project file | ffeil prosiect (The file that contains information about the files that have been imported into or captured in the current project, and how files or clips have been arranged) |
| comp., MS | readme file | ffeil gwybodaeth (A file containing information that the user either requires or will find informative and that might not have been included in the documentation. Readme files are placed on disk in plain-text form (without extraneous or program-specific characters) so that they can be read easily be a variety of word processing programs) |
| comp., MS | security file | ffeil diogelwch (A file that contains a digital code that makes it possible to seal messages or to add a digital signature to messages. This file can be stored on a 3.5-inch disk or on your computer's hard disk) |
| comp., MS | self-extracting file | ffeil sy'n echdynnu ei hun (An executable program file that contains one or more compressed text or data files. When a user runs the program, it uncompresses the compressed files and stores them on the user's hard drive) |
| comp., MS | smart file | ffeil glyfar (A file that is only available when a device is connected to the Internet so that the file's data uses little space in the device's storage) |
| comp., MS | source file | ffeil ffynhonnell (A file that contains the data that a program will process and store in a destination file) |
| comp., MS | subscription file | ffeil tanysgrifio (An audio or video file that you rent from an online store, typically for a monthly fee) |
| comp., MS | swap file | ffeil gyfnewid (A hidden file on the hard disk that Windows uses to hold parts of programs and data files that do not fit in memory. The paging file and physical memory, or random access memory (RAM), comprise virtual memory. Windows moves data from the paging file to memory as needed and moves data from memory to the paging file to make room for new data) |
| comp., MS | test file | ffeil brawf (A file used as part of a testing process to check the validity or correctness of a program or procedure) |
| comp., MS | .theme file | ffeil .thema (A renamed .ini file that points to the theme resources and contains theme values such as colors, fonts, and window size metrics) |
| comp., MS | transaction log file | ffeil log trafodyn (A file that contains a record of the changes that were made to an Exchange database. All changes to the database are recorded in the transaction log files before they are written into the database files. If a database shuts down unexpectedly, unfinished transactions can be restored by replaying the transaction log files into the database) |
| comp., MS | Web Part description file | ffeil disgrifio Rhan Gwe (An .xml file that defines the default property settings for a Web Part, including references to other files that are required to run and display the part) |
| comp., MS | Web.config file | ffeil web.config (An XML file with the .config file name extension that contains settings for an application, Web site, or server. Common configuration files include Machine.config and Web.config) |
| comp., MS | workbook file | ffeil llyfr gwaith (A file that contains a byte stream representation of a workbook) |
| comp., MS | workflow configuration file | ffeil ffurfweddu llif gwaith (An implementation-specific file that is a part of a workflow. The workflow configuration file contains information that is necessary to create a workflow template from the specified workflow markup and rules files, and to associate it to a specific list) |
| comp., MS | workflow markup file | ffeil marcio llif gwaith (A file that contains markup to specify the functional behavior of a workflow) |
| comp., MS | workspace file | ffeil man gwaith (A file that saves display information about open workbooks, so that you can later resume work with the same window sizes, print areas, screen magnification, and display settings) |
