An .LDT file, also known as the ZENAX Source EULUMDAT, is a data file that is used by ZEMAX software. The software is used by optical engineers to design lens, illumination, optical design, laser beam propagation, and other photometry data. The LDT file contains measured photometry data for real lamps that is supported in EULUMDAT format, and the LDT files are used by the Source EULUMDAT file objects in non-sequential mode.
The following listing features LDT-compatible programs. LDT files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.
Being unable to open files with LDT extension can be have various origins. Fortunately, most common problems with LDT files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with LDT files.
Problems with opening and working with LDT files are most probably having to do with no proper software compatible with LDT files being present on your machine. This one is an easy one. Select ZEMAX or one of the recommended programs (for example, EulumdatTools) and download it from appropriate source and install on your system. The full list of programs grouped by operating systems can be found above. If you want to download ZEMAX installer in the most secured manner, we suggest you visit ZEMAX Development Corporation website and download from their official repositories.
You still cannot access LDT files although ZEMAX 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. If you have an older version of ZEMAX installed, it may not support LDT format. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using ZEMAX.
If the issue has not been solved in the previous step, you should associate LDT files with latest version of ZEMAX you have installed on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.
The procedure to change the default program in Windows
The procedure to change the default program in Mac OS
Should the problem still occur after following steps 1-3, check if the LDT file is valid. Being unable to access the file can be related to various issues.
If the LDT is indeed infected, it is possible that the malware is blocking it from opening. Scan the LDT file as well as your computer for malware or viruses. If the LDT file is indeed infected follow the instructions below.
Did you receive the LDT file in question from a different person? Ask him/her to send it one more time. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. If the LDT file has been downloaded from the internet only partially, try to redownload it.
Some files require elevated access rights to open them. Log in using an administrative account and see If this solves the problem.
If the system is under havy load, it may not be able to handle the program that you use to open files with LDT extension. In this case close the other applications.
Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with ZENAX Source EULUMDAT Format file. It may be the case that the LDT files work properly with updated software that addresses some system bugs.
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