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I am writing out a comma separated file using a console app, and than using Process to open the file. It's a quick and dirty way of dumping results of a query into excel.

for a while this worked fine, but lately i started getting "The file you are trying to open 'blah.csv', is in a different format than specified by the file extension".

and than after clicking "Yes"

Excel has detected that blah.csv is a SYLK file, but cannot load it. Either the file has errors or it is not a SYLK file format. Click OK to try to open the file in a different format.

Pressing OK opens it, and displays correctly.

I see some solutions for this in web world with adding content-disposition header, but since i am using a Process to open it, i can't apply that fix.

my code to open the file:

ProcessStartInfo info = new ProcessStartInfo();
info.FileName = filePath;
info.UseShellExecute = true;
Process.Start(info);

if i open the file in Notepad++ and show all chars, it just shows as regular CSV with CR LF line endings.

after some investigation, it looks like the headings line is triggering the error. If i simply write a empty line before the headings, the error goes away. the headings look like this:

heading1,heading2,heading3 CRLF

Have a look here: http://support.microsoft.com/kb/323626

it seems having ID as the first two chars on the header row is the issue - pretty bizarre behaviour from Excel in my opinion.

generating/opening CSV from console, Have a look here: http://support.microsoft.com/kb/323626. it seems having ID as the first two chars on the header row is the issue - pretty bizarre behaviour from  CSV clean will validate and clean the file of common syntax errors. It isn’t magic, but can definitely help. CSV grep is incredibly useful. It’s similar to UNIX grep but optimized for CSV files. It can do a grep on just certain columns, for example. CSV SQL will generate a CREATE TABLE SQL statement based on the file.

The CSV starts with the two characters ID. If you surround the characters with double quotes it should work fine.

Wrong characters display when exporting files to CSV , I am writing out a comma separated file using a console app, and than using Process to open the file. It's a quick and dirty way of dumping results of a query into  The problem with the CSV files is that the encoding used to generate the file is not written anywhere in the file (due to the nature of the file, that, like the extension says, it's just a list of "comma separated values") so when you open it, Excel tries to "guess" the encoding used, but it fails

(EDITED) I had a similar issue - I was getting the exact same error, but in my case this had suddenly occurred after months of frequent use. I wondered if the problem really is the "ID" column title, Microsofts solution doesn't explain why, as the OP stated, "for a while this worked fine" and then became a problem.

I found in my scenario there was some erroneous data coming from an upstream system where a comma had been added in someone's first name, and this was invalidating the .csv file. This caused the 'file is in wrong format error' but sent me down the wrong path with the ' [filename] is a SYLK file, but cannot load it'

hope this might help someone else one day.

5 Magic Fixes for the Most Common CSV File Problems, generating/opening CSV from console - file is in wrong format error. I am writing out a comma separated file using a console app, and than using Process to  A CSV file is nothing more than a text file with its data values separated by commas (hence the name "comma separated values" or CSV). These text files can be difficult to read as just straight text. Fortunately, CSV files have the advantage of being read in a spreadsheet program, which allows the file to be read in organized columns and rows.

SYLK file format is not valid error occurs when the CSV file has first two characters are in the uppercase I and D. It can be resolved by the following steps: Open the file in Notepad and hit apostrophe (’) key before the 1st character. Save the file and reopen MS Excel.

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Avoiding the "Invalid CSV File" error message while importing , I've encountered a thousand different problems with data importing and flat files CSV SQL will generate a CREATE TABLE SQL statement based on the file. this problem if you get some unusual error messages when you try to load the file​, You can use a vi command like this to replace the line breaks with the correct​  Common problems when importing or exporting respondents ADVANCED. This FAQ applies to surveys where you have chosen to enable survey access control and create a list of respondents. Note: Files larger than 10Mb cannot be uploaded to online surveys. If your respondent list is very large, please split it into two or more files before attempting

How can I fix the UTF-8 error when bulk uploading users?, commas – this will correct problems you're facing with cells and formatting. When attempting to open a CSV file via Excel, you may see an alert stating (PC​), or Command+Shift+V (Mac) while pasting to strip all formatting while The error will not appear if you save in a current file format, such as .xlsx, .xltx, or .xlsb. A CSV file has a fairly simple structure. It’s a list of data separated by commas. For example, let’s say you have a few contacts in a contact manager, and you export them as a CSV file. You’d get a file containing text like this: Name,Email,Phone Number,Address. Bob Smith,bob@example.com,123-456-7890,123 Fake Street.

Exporting Data to Excel < PHP, This file format will throw off your data, and you will need to export the gradebook again and start from scratch in order to import your grade changes successfully. To translate this article, select a language. "No point file format match found" . Source file is open while trying to sample in Civil 3D. Bad data in the point file (i.e. extra periods, blank spaces or formatting issues). Note: Close point file before importing. Open your point file with Notepad and make sure there are not unwanted characters

Comments
  • Could you post the first few lines of the file? Anonymized, if necessary.
  • thanks, yah my fields start with 'ID...'.. that is bizzare thanks Microsoft!
  • I just solved my problem (same as OP) with this answer. Thanks!
  • When I encountered the issue I was intuitively thinking that might be the problem, but then I thought nah they wouldn't do that...
  • Same. Thanks, John. And thank you, Readmond Hellion; waster of lives and crusher of souls.
  • Avoid asking question as answer.
  • I don't have a hight enough reputation to comment on existing answers so could only post as an answer. The downvote is a bit harsh but thanks for getting involved! I do now have further information to add now, so will attempt to edit my first post...
  • downvote was not to hurt you but part of review. And, passing such question without flag or downvote can lead reviewer in trouble, believe me flagging is worse. My suggestion is wait for 50 rep before you start commenting. Till then if you have a genuine question, ask it as separate question.
  • Thanks, your advice is noted. I have edited my post.
  • Welcome to Stack Overflow! How to Answer can help you write answers that will be accepted and upvoted.