Der Dateiname ist falsch, deshalb finde ich das Dokument nicht.

Dateiname is a compound noun made from Datei + Name.

German very often combines nouns into one word. The last part is especially important, because it tells you the basic type of thing it is. A Dateiname is literally a kind of Name.

In German compound nouns, the last element determines the gender.

• die Datei = feminine
• der Name = masculine
• der Dateiname = masculine

So even though Datei is feminine, the whole compound is masculine because Name is the final part.

Here das Dokument is the direct object of finden, so it is in the accusative case.

The verb finden usually takes an accusative object.

Why does the article stay das? Because Dokument is a neuter noun, and in the singular, the nominative and accusative forms are the same:

• nominative: das Dokument
• accusative: das Dokument

So the case changes, but the article does not look different.

Because deshalb takes the first position in the clause, and in a German main clause, the finite verb must come in second position.

So the order becomes:

• deshalb = position 1
• finde = position 2
• ich = after the verb

That is why you get deshalb finde ich.

Not exactly. Deshalb is better thought of as an adverbial connector, not a subordinating conjunction like weil.

That matters because the word order is different:

• ..., deshalb finde ich das Dokument nicht.
• ..., weil ich das Dokument nicht finde.

With deshalb, the clause stays a main clause, so the verb is still in second position.

With weil, the clause becomes subordinate, so the verb goes to the end.

Here nicht negates the action finde das Dokument as a whole.

In German, when nicht negates the main idea of the clause, it often comes quite late, usually after the object:

• Ich finde das Dokument nicht.

That is the normal placement here.

If you move nicht, the emphasis changes. For example:

• Ich finde nicht das Dokument would suggest something like It is not the document that I find.

So the position of nicht affects what is being negated.

Use kein to negate an indefinite noun:

• Ich finde kein Dokument. = I do not find any document.

Use nicht when negating:

• a verb
• an adjective
• an adverb
• or a noun phrase with a definite article

Since this sentence has das Dokument (a specific document), nicht is the correct choice:

• Ich finde das Dokument nicht.

Here falsch means wrong or incorrect.

It suggests that the filename is not the correct one, or has been entered incorrectly. It does not mean something is damaged or broken. So falsch is about correctness, not physical condition.

Because the sentence contains two main clauses:

• Der Dateiname ist falsch
• deshalb finde ich das Dokument nicht

In standard written German, a comma is used here to separate the two clauses clearly.

Yes. Those words are very similar in meaning and are often interchangeable:

• Der Dateiname ist falsch, deswegen finde ich das Dokument nicht.
• Der Dateiname ist falsch, daher finde ich das Dokument nicht.
• Der Dateiname ist falsch, darum finde ich das Dokument nicht.

They also behave the same way in word order: if they come first, the verb still comes second.

They are very close, and both are natural.

• Ich finde das Dokument nicht = a simple statement that I am not finding it
• Ich kann das Dokument nicht finden = slightly more emphasis on inability

In many everyday situations, the difference is small, and either version could work.