Why my .py code can't find any .txt files?

[Exiliesalpha]

Hello, I am having a problem with my fhand=open() codes I don’t really know why but the code itself is not working, it can’t detect the .txt file even if they are in the same folder. what should I do here is my code and the error it gives to me.
The code:

ffile=input('ENTER THE FILE''S NAME...:')
fhand=open('file.txt')
sayiLine=0
uzunluk=fhand.read()
for line in fhand:
    sayiLine=sayiLine+1
    line=line.rstrip()
    if not line.starswith('A'):
        continue
    c=input('Dosyanda :', sayiLine,'kadar satır bulunuyor.')
    d=input('Dosyanda :', uzunluk,'kadar karakter mevcut, VE BOŞLUKLAR BUNA DAHİL!!')
    f=input('Son olarak dosyanda aramış olduğun tüm satırlar şunlar:')
    print(line)
    g=input('Çıkmak için enter tuşuna basabilirsin')

The error:

Traceback (most recent call last):
  File "c:\Users\PC\Desktop\PYTHON FALL\deneme.py", line 4, in <module>
    uzunluk=fhand.read()
  File "C:\Users\PC\AppData\Local\Programs\Python\Python310\lib\encodings\cp1254.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x9e in position 97: character maps to <undefined>

[Exiliesalpha]

Thanks for the advice and for showing my mistakes but even this code can’t do its job:

fhand=open('file.txt')
count=0
for line in fhand:
    count=count+1
print('Line count:', count)

I have the file.txt in the same folder with the code.
Is it about my PC or should I just re-install the visual studio or python?

[Exiliesalpha]

Traceback (most recent call last):
  File "c:\Users\PC\Desktop\PYTHON FALL\.vscode\6-deneme.py", line 1, in <module>
    fhand=open('file.txt')
FileNotFoundError: [Errno 2] No such file or directory: 'file.txt'

It says no such file in directory but I have the file.
It did the same thing two days ago but after trying it 4 times it didn’t give me any errors. Now it gives it again.