.CLS file extension
How to open file with .CLS extension?
.CLS is the file extension developed by Esri for the needs of their proprietary software. The files with the .CLS extension belong to the "GPS&GIS Files " category. The full name of this type of files is ArcView Geocoding Classification. Files with the .CLS extension can be opened in several ways. The easiest is to install the manufacturer’s application. Fortunately, this is not the only method. There are many applications on the market that successfully open files with the .CLS extension. Below is a list of such applications. Among them are also applications fully free of charge for home use.
ArcView Geocoding Classification
| Ads | OS | Software |
|---|---|---|
| WINDOWS |
 ArcGIS for Desktop Basic (ArcView) |
JavaScript Class Definition
| OS | Software |
|---|---|
| WINDOWS |
 Firefox |
Microsoft Visual Basic 4 Class Module Add-in
| OS | Software |
|---|---|
| WINDOWS |
 Microsoft Visual Basic  Adobe ExtendScript |
Microsoft Visual C++, Visual Basic Class Definition
| OS | Software |
|---|---|
| WINDOWS |
 Visual C++ Microsoft Visual Basic  Microsoft Visual Studio |
AIM AOL Instant Messenger
| OS | Software |
|---|---|
| WINDOWS |
 AOL Instant Messenger (AIM) |
SQLite 3
| OS | Software |
|---|---|
| WINDOWS |
 SQLite |
LaTeX
| OS | Software |
|---|---|
| WINDOWS |
 Sublime Text  LaTeX |
After downloading and installing the software in our system, files with the .CLS extension should be automatically associated with the new application. With this association, the file can be opened by double-clicking the mouse. If for some reason we still cannot open the file with the .CLS extension, we still have one method. It involves the attempt to open the file from the installed application. Choosing from the menu "FILE", we perform the command "Open" and the explorer window we select the file we are interested in, and then we confirm by pressing enter. This method is more time-consuming, but enables us to definitively state whether we use the correct application to open the files with the .CLS extension. If we are sure of it, we then use the extended reference menu (shift key and right mouse button) and by selecting "Open With", we select the appropriate application and we permanently connect it with a file with the extension we are interested in.