I have a large PST file up to 50 GB, and it's not opening. 

Today there are many tool for split pst file but trust me i suggest you best ever pst split tool which can instantly convert your pst file without wasting you costlytime. Any type of users can easily split pst file through this tool because you don't need any technical knowledge for this tool. this tool Creates several independent PST files by splitting large PST file. The user can split large PST file according to date, email type and user nameOriginal formatting and order of mails are retained in the new PST file. It supports splitting of PST file which is password protected, i'm telling you again No extra technical skill is required to use this tool as it uses self explanatory graphical interface.

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The software splits large pst file on the basis of sender's e-mail ids and date. To split pst file on the basis of date, either you need to enter the total number of months or the exact dates between which you received the e-mails. However, to split pst file on the basis of e-mail ID, you will need to select the mail-ids of the users, whose mails have to be saved into a particular PST file. The software enables the user to view messages in 3-view format, restores formatting from RTF and HTML messages and create unique profile for individual pst files. It supports MS Outlook 2000, 2002(xp), 2003 and Outlook 2007 and compatible with Windows NT4/ 2000/ XP/ 2003/ Vista. It is an easy-to-use and highly effective tool to get your precious mails back to you. The software is Simple to operate, with no prior technical skills required. It is backed up with 24X5 unlimited customer supports and 30 days money back guarantee.Company having more than 15 years of experience and thousands of satisfied clients across 137 countries.

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MS Outlook uses PST (Personal Storage Table) file format to store your mails and other mailbox items. There is a limited size of PST file and if it exceeds that size limit, then the file becomes corrupted.Microsoft outlook does not provide any facility to directly split large pst file into small pst file.  

MS Outlook uses two types of PST files, one is ANSI PST and the other is Unicode PST.

1. The ANSI PST file format has a size limit of 2 GB and was used with MS Outlook 2002 and earlier versions.

2. Unicode PST file provides up to 20 GB size limit, which is used with MS Outlook 2003 and its later versions.

Heavy and Oversized PST contributes equally in making PST management challenging. As size of PST increases more than its limitation then users have to face lots of problems.Outlook users need to manage their PST file size properly time to time. Reduction of PST files size necessary for better file management. But as you reduce PST file size, there would be possibility of data loss.

Don't Worry Reduce PST file Size without any loss!!

Splitting a pst file can be done wtih Archive feature in Outlook. But split through archives prcoess can take yearly (or any other amount such as quarterly, or every 2 years.

I've had the same problem with oversized PST some time ago, so I found best Split PST Tool – Split Large PST Files into Small Ones divides PST file into manageable and smaller PST files as per the specific criterion like size, date, folder and email id, and protects them from any corruption issues because of file size limits.Performs risk-free operation of PST file splitting without making any change on the content or structure of original PST file and the original formatting or RTF and HTML messages.
 
{ Also available in Corporate License and Home User’s License }

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If you're using Outlook Email client application where all your email saved in PST or Personal Storage Table file format then these two thechnique Split and Merge will definitely help you to come back from two major issues:

1. When have large size Outlook PST file.
2. When have large number of Outlook PST file in Outlook account to access.  

Split Technique: This technique will help you to break large size size Outlook PST file in some small PST files so that user can use data of large size file easily. 
Merge Technique: It will allow user combine and merge large number of Outlook email files in one single file.

You can take more information about both two technique from the link: Split and Merge Outlook PST file