When you encounter a problem with an unknown ONETOC2 file and you do not know how to open such file, the first step you should take is to determine the cause of given problem. We will show you how to address most common problems with ONETOC2 files and how to solve them in 4 simple steps.
In some cases problems may occur when trying to open ONETOC2 files. Steps listed below can be helpful in addressing such problems.
The first thing user should do is to associate application with ONETOC2 files. It may happen so that even when an application that supports ONETOC2 files is installed on the system it is not properly associated with this file format. This can be easily remedied by associating program with ONETOC2 files. In order to associate such files with given application, user must open the file menu (by right-clicking on the file) and choosing "Open with". A list of suggested applications will be displayed at the top part of menu. Next, select an application and confirm your choice by checking "Always use the selected application to open this kind of files" option. Confirm your selection by clicking OK.
In majority of cases following instruction in step 1 and 2 should be enough to open files with ONETOC2 extension. Before attempting the next steps, test all the programs listed below.
Should it happen that the section with suggested programs is empty, it is most probable that no program supporting ONETOC2 files is installed on the system. Choose a program from the following list and install it:
If you are still unable to open ONETOC2 file, you should contact an IT expert. You could also try to contact the developer of given software that supports ONETOC2 files. Appropriate website addresses can be found by clicking the name of given program in the list above.