7 File Extension
Have a problem opening a .7 file? We collect information about file formats and can explain what 7 files are. Additionally we recommend software suitable for opening or converting such files.
What is the .7 file type?
Similar to other numerical filename extensions, the .7 extension is primarily encountered in association with the Versioned Pro/Engineer Project file type. An industry-standard CAD solution for a number of hi-tech industries and applications, the Pro/Engineer suite by PTC employs a system of versioned backups. It provides an easy means of tracking changes as well as safeguarding project data with multiple copies.
A versioned Pro/Engineer project is a verbatim copy of the currently active project, made automatically by the software before any changes are committed saved into the file. Versioned project files are assigned numerical extensions in sequence; those are appended to original filenames. This way, a .7 file is the seventh version of a Pro/Engineer project, assuming the existence of the previous six (.1–.6). Versioned projects are handled by Pro/Engineer the same way as regular project files.
The occurrence of the ".7" string as a filename extension can also be related to the original extension being either concealed or missing. If the filename contains dotted numerical portions at its end (e.g., to indicate the file's position in a series), the rightmost of them (in this case, .7) can actually become or look like an extension.
If the original extension is missing, but the file type is known, a proper extension should be added manually after ".7". The original file type/format can be determined by viewing for typical signatures at the file's header with the use of a hexadecimal editor.
On MS Windows machines, the system conceals extensions for known file types by default (the "Hide extensions..." option in Windows Explorer), so the actual extension may just be concealed. For security reasons, the above-mentioned option should always be turned off and extensions displayed at all times.
Finally, dotted numerals like ".7" are often used in filenames of shared libraries, system binaries and scripts, etc. on GNU/Linux operating systems as file version indicators (e.g., "/lib/libxtables.so.7"). Although they may look like it, such dotted numerals are not extensions, but part of the filename instead.
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