The following are the currently known File and Folder namerestrictions for SharePoint:

1. The name can not contain any of the following characters:

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Quotation mark
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Number sign
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Percent Sign
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Ampersand
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Asterisk
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Colon
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Less than Symbol
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Greater than Symbol
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Question Mark
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Backslash
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Left Brace
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Right Brace
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Pipe
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Tilde
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Slash

2. The name can not begin or end with a period

3. The name can not contain a double period
4. The folder name and file name length depends on the SharePoint / OneDrive system used
Separate documentation for determining your maximum folder name and file name lengths is available at [Max Length].
A Free Utility is available to help determine these maximum values at [TestSPOL].

SharePrep provides a convenient user interface to allow youto search your file names and folder names for the above restrictions andprovides functions for automatically renaming the file and folder names toreplace the restricted characters.

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SharePrep is configurable. You can define the action to be used by the rename function for each of therestricted characters. For each, you can choose to delete the character, replacewith a blank or replace with a character or string of characters you specify.
You can add additional entries to Options table. A string ofcharacters can be used for both the search and the replacement characters. This gives you a means for abbreviating portions of file and folder names for the purpose of shortening their names to meet the SharePoint name length restrictions.
SharePrep provides a convenient User Interface for selecting thefolder for processing, setting the Options table and Repairing the file andfolder names.
SharePrep is not just for SharePoint and OneDrive. Some customers areusing SharePrep in their routine maintenance procedures to bulk rename invalid files and folders. For example, some backup / recovery programs have name restrictions. These customers are dealing with files downloaded from the Web and files from non-Windows systems.
The current version of SharePrep implements batch execution. This incorporates use of a command file and provides for use of an alternate options file.
The current version also provides for user override of the 128 byte length tests. This is to give non-SharePoint customers a means for avoiding the name length error messages.

Shortening

For the File Lengths tab and the Folder Lengths tab, folder names will be shortened to the length specified in the Max Folder field and file names will be shortened to the length specified in the Max File field.
In previous versions, this was documented as a separate function,Truncate, which removed characters from the right end of the names. In the current version, the characters are removed from the center of the names which should yield more readable names.
The current version includes a function for reducing path lengths to the length specified in Max Path. The Repair function under Path Lengths performs its name reductions by attempting to remove a proportional number of characters from each level based on the number of characters available for removal.
The Resolve Duplicate Names function can be used to resolve any duplicates created by shortening, etc..

Trial Period and Limitations

SharePrep is currently distributed only as a Limited-Trial. The rename and delete functions are available, but limited, in Limited-Trial mode.
The reason for this marketing approach is that many organizations may need SharePrep for only a single one-day conversion. The Limited-Trial is limited to 15 days and the number of renames / deletes is limited to 50.
However, this approach permits you to use SharePrep as a diagnostic tool to check the lengths of file and folder names as well as to identify the quantity of names that require renaming. In short, you can determine whether you need the rename functions of SharePrep before committing to the purchase of a license.
Upon purchasing a license, you will be sent a Registration Code which you enter into SharePrep to complete the registration process. This will enable all of the program's functions.

Site Licenses

Site Licenses or Multiple-use Licenses are available for larger organizations that need them. These licenses are priced based on the number of computers that would make use of the program. An additional 25% discount is available for Site Licenses for educational institutions, public libraries and government facilities. [Request a Quote]
If your company requires you to fully test software prior to purchase and you are likely to purchase if you could verify that SharePrep would work on your projects and systems, Request a Trial Registration.

Short Filenames

Short Filenames are the shortenedversion of Long Filenames that are created to fit the 8.3 format. That is, thename is only 8 characters and the extension is only 3 characters. Thesystem can maintain both in its directory structure.
By default, Windows 10 is set to not create Short Filenames. This saves a small portion of disk space. Earlier versions of Windows were set to create Short Filenames.
As SharePrep makes use of the Short Filenames for its operations, we are asking our customers to change the Short Filenames registry setting when upgrading to Windows 10.

We are providing a free utility program Reset83.exe for checking and changing the necessary registry setting.

[ Reset83.exe ]

Reset83.exe does not require an install. You may execute it directly from our website or download to your computer and execute it from there.

Further, some larger data centers have transferred MAC-created filesto their servers. As MAC systems allow filenames considered invalidto Windows systems, SharePrep may have trouble with theseparticularly when the invalid character occurs within the short name.
Therefore, Assistance & Resources for Computing, Inc. will refundthe license fee upon receipt of proof that SharePrep is unable toperform as advertised. Any request for a refund must be made within 30 days of the purchase.

Credits

The credit for the idea to create SharePrep belongs to Göran Husman. He is an author, SharePoint MVP, Consultant & Trainer residing in Stockholm, Sweden. Göran is president of HumanData Inventus AB - http://www.humandata.se/ He has published several SharePoint books.
Göran first requested a change in the scan function of Delete Invalid Files, to search for additional characters. After receiving a pre-release copy of the program with the enhanced function, he requested that the program be enhanced to automatically rename files to replace the given characters.
He explained that he had a client with a project containing over 55,000 files to be imported into SharePoint. The scan revealed that there were over 1,000 files with restricted characters that would have to be manually modified before importing into SharePoint.
Development of SharePrep began the next day.
Assistance & Resources for Computing, Inc
Copyright © 2007-2019. All rights reserved.
Revised: May 09, 2020
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