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If a person is using = in their file names then they don't deserve for their solution to work correctly anyway.
So perhaps it's by design.
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 You more or less took the words out of my mouth. 
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Greg Utas wrote: You more or less took the words out of my mouth.
I didn't take them, I found them on the floor. You can't prove anything! 
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musefan wrote: If a person is using = in their file names then they don't deserve for their solution to work correctly anyway.
You talk like a Linux guy!
I was just ordered to remove case insensitive file name matching in this Windows specific tool that I will be maintaing: The routine looked for CMakeLists.txt, and I was told that anyone who uses a different casing for this file is simply doing it wrong - even though the file system explicitly is case insensitive. Case insensitive matching is "unnecessary" in this case, get rid of it!
Up until five to ten years ago, there was a heavy demand from the Linux community that file names should never contain space. We still have tools ported from Linux that crashes if they encounter a file name contianing space, with no way of quoting it properly from the outside because the tools derive the names of new file from it, without considering any qouting. One tool would even barf if it encountered a file with a space in the name even if that file was not referenced: The tool searched a directory, and crashed when trying to stat every file. So we had to make sure that noone put a (completely unrelated) file with a space in the name in any directory used with this tool.
A number of years ago, even Linux based software was forced to accept 8 bit characters (in ISO 8859 format) without stripping off the "parity bit" - but still there are lots of legacy tools that handle it poorly, and you may have to know all the different ways of quoting to get it right if you are working in a command shell. Today, even Linux (at least some distros!) even accept Unicode file names - but don't expect every application to handle it well!
Lots of businesses and organizations have names including a slash: A shareholder's company is in Norwegian an "aksjeselskap", an "A/S". Ships are often named by the kind of ship: "M/S Norway" is the SailingShip Norway, and so on. Such use of slashes in abbreviations are common in many European languages. Lots of Linux software will have problems if you use these organization names in file names. It used to be OK in DOS/Windows, but the pressure was too strong to accept ported *nix applications without adapting them at this point, so just to be kind to those *nix guys, DOS/Windows (sorry... DOS_Windows ...) introduced problems for the user by accepting the slash as an alternative path separator.
It has been claimed that the backslash was deliberately selected as the directory separator in DOS, rather than the forward slash, to avoid conflicts with traditional use of slash in names.
We may see that as a give-and-take: End user communities sacrified the slash in exchange for beyond-7bit-ASCII file names. Without the pressure from the Windows side, I am sure that Linux file names would have been at ASCII level even today.
If you manage to create a file name containing a wildcard (to non-computer people, calling a file "What to do now?" or "*** IMPORTANT POINTS ***" would be perfecly natural), you will run into problems.
In a CLI environment, names including a "&" (like in "Jonhs_Fish&Chips") may require quoting if used on the command line. Nor are ">" and "<" great as file name characters, as well as a number of other characters, e.g. used to identify alternate streams, or in some older file systems (non-Windows/*nix) file version.
Lots (but not all) of these restrictions are due to command line interfaces - the applications could have handled it, many don't but assume that e.g. a space terminates a file name (especially *nix born software).
But equal signs are still legal. You argue for restricting the set of "legal" file names even beyond that which is imposed by the file system itself. I think this is the wrong way to go. Ordinary people do not recognize the technical grounds for probiting any of these characters, and being told that that "they don't deserve for their solution to work correctly" because they use file names that make perfectly sense to them - and in this case even is a "technically" valid file name - is not the way I want software to move. It should rather go in the very opposite direction!
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Member 7989122 wrote: You talk like a Linux guy!
Never used it.
Member 7989122 wrote: Ordinary people do not recognize the technical grounds for probiting any of these characters
Ordinary people won't be creating solutions in Visual Studio in the first place.
The point isn't that people shouldn't be able to use =, the point is that there shouldn't be a need to name a file with an = symbol in it. Can you provide a reasonable example of a filename that you would add to a Visual Studio project that contains = symbol?
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Huh? Why not?
Project names appear as file names. Why couldn't a project be called "Algorithmic proof that A^n + B^n = C^n is false for any n greater than 2"? Or "Overloads of ="?
"Overloads of >" would not be valid file/project name, but "Overloads of =" is. So the project file format should handle it. I am happy to see "qouting free" file names - I really hate the umpteen different ways of quoting, character escapes and the like - but that usually takes binary formats to handle. When old traditions and legacy pressures you to remain with the age old "ASCII philosophy", then you must provide the proper quoting and character escaping, no matter how ugly it looks.
At least modern .sln files use UTF-8 encoding, capable of representing arbitrary printable text without resorting to neither backslash escapes with octal codes, backslash with hex codes, backslash with code letters and special chars like \\, HTML character entities, Quoted Printable, base64 or possibly old style UUE, atob/btoa, StuffIt or whatever format you prefer for packing non-ASCII characters into an ASCII representation. I'm happy to avoid that, but why don't we go the full length, and go for binary TLV formats, to avoid all of these problems?
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lol! you're not wrong.
Real programmers use butterflies
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That's a fairly standard format for property files, and has been since the early days of Windows. Unfortunately when they moved to the modern file systems and allowed (more or less) any character in a filename, there were unforeseen consequences.
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Maybe it is "fairly standard" but probably not quite as standard as XML, which would have avoided this particular issue and simplified life for a lot of people...
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Yes but that "standard" was created long before the days of XML, and used by other manufacturers. And, to be fair to Microsoft, they have used XML in many other places, including Visual Studio project files.
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This is in devstudio 2019.
I know that people probably "shouldn't" use equals in their filenames, but they *can*.
Meanwhile, devstudio silently fails when it happens.
There's really no excuse. Not even for an ancient file format being used as a primary file format for devstudio files.
Real programmers use butterflies
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Not heard of devstudio, is that a Microsoft product?
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devenv is the executable name for Visual studio and devstudio has been a nickname for visual studio since at least as far back as visual studio 6.0
Real programmers use butterflies
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I worked on 6.0 but don't remember what it was called. But then at my age I don't remember what i had for dinner last night. 
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well, i like the name because it's shorter than Visual Studio, and "VStudio" is dumb. 
Real programmers use butterflies
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I see the basic problem as caused by a "command line philosopy". There is a strong correlation between textual command line input and textual configuration files as input to a program system.
Configuration (and similar) info should be stored in some "binary" format. If you don't want to use a fullblown database, at least the configuration file should be built from Tag-Length-Value records, with an unrestricted Value field.
If, say, MS had promoted a basic TLV structure common to all system needing configuration info, a general reader/editor for this forma could be written, by MS or by anyone else. Such an editor could of course provide various export formats for use in Linux and other legacy systems, adding quoting as required by that format. But the authoritative file should be in the TLV format with no values - file names or others - being restricted by configuration file formats.
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My only problem with a binary format is I've never found an IDE I can trust entirely with my source. If it corrupts it, I'm hosed.
Real programmers use butterflies
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Have you tried creating a file named CON, with any extension, on Windows?
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Daniel Pfeffer wrote: and how many stowaways?
Careful ... Mars will start building a wall, and getting us to pay for it ... 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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MAGA - Make Ares Green Again?
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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It's actually brown, extremely sweet and sticky: Milky Way, as seen from Mars[^]. I would not like it very much if it turned green.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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At a time when governments are urging us to use car sharing to "save the planet", perhaps a bit of rocket sharing might be in order...
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Well ... it'll only be seen by people who might want to use it ... 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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