Quick Answer
The least likely cause of a "cannot write to file" error is that the file has been deleted. This is because the error message specifically mentions the file may be read-only or in use by another application, which points to a write conflict or permission issue rather than a missing file. If the file were deleted, the operating system would typically generate a "File not found" or "The system cannot find the file specified" error, not a write failure. On the CompTIA ITF+ FC0-U61 exam, this question tests your ability to interpret error messages and match them to their underlying causes, a common trap being that students confuse file deletion with write restrictions. A useful memory tip is to remember that "write" errors involve access or locks, while "missing" errors involve existence—so if the file is gone, you can't write to it, but the error would say it's not there, not that it's blocked.
This FC0-U61 practice question tests your understanding of applications and software. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An application is displaying an error message: "Cannot write to file. The file may be read-only or in use by another application." Which of the following is the LEAST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
The file has been deleted.
A deleted file would result in a 'file not found' error, not the one given.
The file system is full.
Why wrong: A full disk would prevent writing and may show a similar error.
The file is open in another program.
Why wrong: This is a common cause of the error described.
The user does not have write permissions.
Why wrong: Lack of permissions would also trigger the error.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The file has been deleted.
Option A is correct because if the file has been deleted, the error message would typically be 'File not found' or 'The system cannot find the file specified,' not a write failure related to read-only status or another application's lock. The error specifically indicates a write conflict or permission issue, not a missing file. Therefore, a deleted file is the least likely cause among the options.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The file has been deleted.
Why this is correct
A deleted file would result in a 'file not found' error, not the one given.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
The file system is full.
Why it's wrong here
A full disk would prevent writing and may show a similar error.
The file is open in another program.
Why it's wrong here
This is a common cause of the error described.
The user does not have write permissions.
Why it's wrong here
Lack of permissions would also trigger the error.
Common exam traps
The trap here is that candidates may assume a deleted file could cause a write error, but the specific wording 'read-only or in use' points to permission or locking issues, not a missing file, which would produce a distinct error message.
Trap categories for this question
Similar concept trap
A full disk would prevent writing and may show a similar error.
Command / output trap
A full disk would prevent writing and may show a similar error.
Detailed technical explanation
Under the hood, file write operations involve system calls like WriteFile() on Windows or write() on Linux, which check for file locks (e.g., mandatory or advisory locks via flock() or LockFileEx()) and file system quota/space before writing. A deleted file would cause the file handle to become invalid, resulting in an error like ERROR_FILE_NOT_FOUND (2) or EBADF, not a write-permission or lock conflict. In real-world scenarios, antivirus software holding a temporary lock can also trigger this error, mimicking option C.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Applications and Software — This question tests Applications and Software — Read the scenario before looking for a memorised answer..
The correct answer is: The file has been deleted. — Option A is correct because if the file has been deleted, the error message would typically be 'File not found' or 'The system cannot find the file specified,' not a write failure related to read-only status or another application's lock. The error specifically indicates a write conflict or permission issue, not a missing file. Therefore, a deleted file is the least likely cause among the options.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This FC0-U61 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U61 exam.
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