CAS4 file format description

Many people share .cas4 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .cas4 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .cas4 files.

1 filename extension(s) found in our database.

.cas4 - Cascade DTP v4 Layout

The CAS4 data files are related to Cascade DTP. The CAS4 file is a Cascade DTP v4 Layout. Cascade DTP is a web page composition tool that harnesses the powerful features of cascading style sheet (CSS) layout and formatting commands. The Cascade DTP seems to be no longer supported.

Cascade DTP
Data files
- / -
Cascade DTP v4 Layout related extensions:
Chaos Desktop Metadata
GP-Pro EX Library
CoCreate SolidDesigner Data
IsoBuster Saved Search Data
Microsoft Exchange Database
Alphacam Router Param Macro

Naturally, other applications may also use the .cas4 file extension. Even harmful programs can create .cas4 files. Be especially cautious with .cas4 files coming from an unknown source!

Can't open a .cas4 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 .cas4 file extension is often given incorrectly!

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

as4, ca4, cas, case, cast, cs4

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Comma-Delimited ASCII Text
Medieval 2: Total War Model Data
Autodesk Cascade License Data
AskSam Database Backup
SurfSaver Data
Bitdefender CAS Data

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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If you have useful information about the .cas4 file format, then write to us! >> CAS4 file