RU File Extension

What is RU file?

File with RU extension is a Java development environment ancillary file. Such file allows users to us Cyrilic (Russian) font glyphs. Standard Latin fonts will be replaced by Russian fonts should RU file be used. Details regarding specific mappings can be found in font.properties.ru file.

Properties files

Java virtual machine uses so called properties files. Such files are loaded by the program on launch. In order to use properties file form the code level, the java.util.properties interface must be implemented. Such solution allows developer to used data in .RU dynamically.

Programs which support RU file extension

The list that follows enumerates programs compatible with RU files, divided into 3 categories based on operating system on which they are available. Files with RU extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

Updated: 04/17/2020

How to open file with RU extension?

Being unable to open files with RU extension can be have various origins. What is important, all common issues related to files with RU extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Install Java Runtime Environment software

The most common reason for such problems is the lack of proper applications that supports RU files installed on the system. This one is an easy one. Select Java Runtime Environment or one of the recommended programs (for example, Windows Notepad) and download it from appropriate source and install on your system. On the top of the page a list that contains all programs grouped based on operating systems supported can be found. The safest method of downloading Java Runtime Environment installed is by going to developer’s website () and downloading the software using provided links.

Step 2. Check the version of Java Runtime Environment and update if needed

You still cannot access RU files although Java Runtime Environment is installed on your system? Make sure that the software is up to date. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. This can be one of the causes why RU files are not compatible with Java Runtime Environment. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Java Runtime Environment.

Step 3. Set the default application to open RU files to Java Runtime Environment

After installing Java Runtime Environment (the most recent version) make sure that it is set as the default application to open RU files. The next step should pose no problems. The procedure is straightforward and largely system-independent

Selecting the first-choice application in Windows

• Clicking the RU with right mouse button will bring a menu from which you should select the Open with option
• Select Choose another app → More apps
• Finally select Look for another app on this PC, point to the folder where Java Runtime Environment is installed, check the Always use this app to open RU files box and conform your selection by clicking OK button

Selecting the first-choice application in Mac OS

• By clicking right mouse button on the selected RU file open the file menu and choose Information
• Open the Open with section by clicking its name
• From the list choose the appropriate program and confirm by clicking Change for all....
• Finally, a This change will be applied to all files with RU extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Ensure that the RU file is complete and free of errors

If you followed the instructions form the previous steps yet the issue is still not solved, you should verify the RU file in question. Being unable to access the file can be related to various issues.

1. Check the RU file for viruses or malware

If the RU is indeed infected, it is possible that the malware is blocking it from opening. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the scanner detected that the RU file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Verify that the RU file’s structure is intact

If the RU file was sent to you by someone else, ask this person to resend the file to you. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. It could happen the the download process of file with RU extension was interrupted and the file data is defective. Download the file again from the same source.

3. Check if the user that you are logged as has administrative privileges.

Some files require elevated access rights to open them. Switch to an account that has required privileges and try opening the Java Russian Font Properties Format file again.

4. Make sure that the system has sufficient resources to run Java Runtime Environment

If the systems has insufficient resources to open RU files, try closing all currently running applications and try again.

5. Check if you have the latest updates to the operating system and drivers

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with Java Russian Font Properties Format files. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle RU files.

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