>> T12 file

T12 file format description

Many people share .t12 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .t12 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .t12 files.

1 filename extension(s) found in our database.

.t12 - At Home 2012 Tax Return Data

The T12 data files are related to At Home 2012. T12 file is an At Home 2012 Tax Return Data. H&R Block at Home is a tax preparation program offered by H&R Block.

At Home 2012
Data files
- / -
At Home 2012 Tax Return Data related extensions:
CN3 Extended Ephemeris Data
CN3 Compressed Extended Ephemeris Data
HPE LoadRunner Analyzed Results
HPE LoadRunner Raw Results
Timeliner 5 Data
Pentaho Reporting Archive

Naturally, other applications may also use the .t12 file extension. Even harmful programs can create .t12 files. Be especially cautious with .t12 files coming from an unknown source!

Can't open a .t12 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .t12 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

12, h12, f12, r12, g12

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Male MRI Image
MS-DOS 12-pixel Screen Font

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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If you have useful information about the .t12 file format, then write to us!

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