tmp extension that identifies temporary files. Such files are created during the execution of applications and are stored on the hard disk. They are usually removed when you close the program that generated them.
Temporary files are files created in Windows or any application to temporarily store information you need, and then deleted, but this does not always happen and sometimes we have to delete them by hand.
Most of the temporary files have extension .tmp and stay the directory / windows / temp, but is not the only place where there are temporary, if some file can not be deleted from windows and really want to delete it because of its size.
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Definition of Windows Temporary Files:
A Windows temporary file is created under the following three circumstances:
1. Windows Desktop applications, such as Write, and multiple document interface (MDI) applications, such as Excel, create temporary files to handle necessary user editing.
Because a Desktop application cannot have multiple documents open at once, it must immediately create a temporary file that allows you to undo any editing. MDI applications create temporary files only when necessary (for related editing), rather than for every worksheet that is open.
2. When you run an MS-DOS-based standard application with Windows/286, Windows/286 creates a temporary file (for example, ~PIFCHFA.TMP) so that it can swap to disk to make room for other applications to use memory.
3. When you print from Windows or any Windows-based application with the spooler enabled, Windows creates temporary files on the hard disk. Windows spools the print job to the temporary file and then sends it to the appropriate printer as a background operation.
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More Info Regarding File Extension Tmp
What to Do with Temporary Files:
A number of files may appear on the hard drive in various directories beginning with a tilde character (~) and ending with a .tmp extension. These may be temporary files created by Windows that remain on the hard drive due to an irregular exit from a Windows session.
Under normal conditions, these files are closed and deleted by Windows when you quit a Windows session. However, if you quit Windows in an irregular way (for example, restarting the computer or turning it off during an active Windows session) the files are not closed or deleted.
The temporary files should be located in a designated sub directory of their own. If temporary files appear in the root directory, you may have an invalid SET TEMP statement. Check for the following conditions:
1. Using a text editor, such as Microsoft Windows Notepad, open the AUTOEXEC.BAT file and make sure it includes a valid SET TEMP statement. This statement should be similar to the following:
2. SET TEMP=C: WINDOWSTEMP
3. Note the path that the SET TEMP statement points to and check to ensure that such a sub directory does exist. If not, create a sub directory to match the SET TEMP statement.
4. If the SET TEMP statement is pointing to a RAM drive makes sure the RAM drive is large enough to hold the temporary files being created.
By ensuring that there is a valid SET TEMP statement and a separate sub directory for temporary files, these files can easily be deleted on a regular basis.
To delete a temporary file, use the following steps:
1. Close Windows.
2. From the MS-DOS command prompt, change to the TEMP directory.
3. Delete any existing .TMP files. Make sure Windows is not running at the time these files are deleted. Some of these .TMP files may be files that Windows is using.
Using Temporary Files Can Improve Application Performance:
If you use temporary files, you can significantly increase the performance of your application.
By using Create File () with the FILE_ATTRIBUTE_TEMPORARY flag, you let the system know that the file is likely to be short lived. The temporary file is created as a normal file. The system needs to do a minimal amount of lazy writes to the file system to keep the disk structures (directories and so forth) consistent. This gives the appearance that the file has been written to the disk. However, unless the Memory Manager detects an inadequate supply of free pages and starts writing modified pages to the disk, the Cache Manager's Lazy Writer may never write the data pages of this file to the disk. If the system has enough memory, the pages may remain in memory for any arbitrary amount of time. Because temporary files are generally short lived, there is a good chance the system will never write the pages to the disk.
To further increase performance, your application might mark the file as FILE_FLAG_DELETE_ON_CLOSE. This indicates to the system that when the last handle of the file is closed, it will be deleted. Although the system generally purges the cache to ensure that a file being closed is updated appropriately, because a file marked with this flag won't exist after the close, the system fore goes the cache purge.
